# Source library and reading guide

Sources were checked for this local edition on **October 1, 2026**. Attachment citations link directly to the original SAM.gov downloads. Preserved local copies remain available as backups; live links may change. Nearby article citations identify the source of specific claims. Public references do not automatically supersede attachments or resolve procurement ambiguities.

## Original opportunity attachments

| Source | Open the source | What it contributes |
|---|---|---|
| Original user analysis | [Original analysis text](../sources/original-analysis.txt) | Feasibility judgment, architecture proposal, model shortlist and five proof gates. Preserved verbatim; its old sandbox links remain historical text. |
| Draft SOW | [Word document](https://sam.gov/api/prod/opps/v3/opportunities/resources/files/34eacfe92b1a46228b9f90674c4c60e1/download) · [Local backup](../sources/SOW-TTS-DTB_draft.docx) · [Text extract](../sources/SOW-text-extract.txt) | Scope, functions, integration, support, ownership, documentation, phases and milestones. Use section numbers rather than fixed Word page numbers. |
| J1 | [1203:2018 construction specification](https://sam.gov/api/prod/opps/v3/opportunities/resources/files/158655a84f024ae591f1b98e591bd801/download) · [Local backup](../sources/J1-construction-2018.pdf) | 31 pages; version 1.3, January 2019. Exact NLS construction rules. |
| J2 | [Z39.86-2005 R2012](https://sam.gov/api/prod/opps/v3/opportunities/resources/files/f14f0acd77f64c29ad4d40567abbfab1/download) · [Local backup](../sources/J2-ANSI-NISO-2005.pdf) | 95 pages; a different edition from the SOW's stated 2002 target. Its printed page numbers have a 12-page front-matter offset. |
| J3 | [QA201801 navigation instructions](https://sam.gov/api/prod/opps/v3/opportunities/resources/files/48b52294c2f44f0780f220a9eff56cbd/download) · [Local backup](../sources/J3-navigation-2018.pdf) | Eight pages; version 2.0, December 2018. How book structure becomes navigation. |
| Opportunity | [SAM.gov notice 2027-NLS-0075](https://sam.gov/opp/5e1bed195d704dc189d7a231c4a5ab9c/view) | Original opportunity and attachment context. Check it for later amendments. |

The attachment links above are public SAM.gov download endpoints, without session tokens or API credentials. If a direct download becomes unavailable, return to the [opportunity attachment list](https://sam.gov/opp/5e1bed195d704dc189d7a231c4a5ab9c/view#attachments-links) or use a local backup.

The original analysis and SOW text extract are local supplementary files, not attachments hosted on SAM.gov. The SOW text extract is a convenience copy; layout and table relationships may be flattened, so use the Word original to resolve ambiguities.

PDF links with `#page=` use one-based file page numbers, not necessarily the printed number on the page. Browser support for opening at a specific PDF page varies, and SAM.gov may download a PDF rather than display it at the requested page.

## Standards and production references

| Primary reference | Why follow it |
|---|---|
| [NLS construction 1203:2025](https://www.loc.gov/nls/who-we-are/guidelines-and-specifications/contract-specifications/digital-talking-book-requirements/) | Compare the newer public construction rules with attached J1. |
| [NLS mastering 1202:2026](https://www.loc.gov/nls/who-we-are/guidelines-and-specifications/contract-specifications/audiobook-mastering/) | Master-audio parameters and heading preparation; clarify application to synthesis. |
| [NLS delivery 1206:2025](https://www.loc.gov/nls/who-we-are/guidelines-and-specifications/contract-specifications/dtb-delivery-requirements/) | Archive layout, ZIP details and Transfer Portal delivery. |
| [NLS specification index](https://www.loc.gov/nls/who-we-are/guidelines-and-specifications/contract-specifications/) | Discover the complete applicable specification family. The indexed mastering date differs from the live page. |
| [NLS 1205 protection PDF](https://www.loc.gov/nls/wp-content/uploads/2019/09/1205_Final_nov15_1_07.pdf) | Catalogued November 2007 reference; direct retrieval failed during this review. Its clauses and governing revision were not independently verified here. |
| [LOC AMR-WB+ format description](https://www.loc.gov/preservation/digital/formats/fdd/fdd000256.shtml) | Additional official format context and link to 1205. |
| [ANSI/NISO 2002](https://www.daisy.org/z3986/specifications/Z39-86-2002.html) | The standard explicitly cited in the SOW and NLS construction profile. |
| [ANSI/NISO 2005 R2012](https://daisy.org/z3986/2005/Z3986-2005.html) | Online counterpart to the attached later edition. |
| [DAISY PDTB specification](https://daisy.org/activities/standards/pdtb/daisy-protected-digital-talking-book-specification/) | Concepts behind protected content and authorization/key material. |

## Models and reusable software

| Reference | Scope of evidence |
|---|---|
| [Qwen3 TTS project](https://github.com/QwenLM/Qwen3-TTS) and [1.7B Base model](https://huggingface.co/Qwen/Qwen3-TTS-12Hz-1.7B-Base) | Documented variants, local loading and exact model-card license. |
| [Chatterbox](https://github.com/resemble-ai/chatterbox) | Official model options, controls and project license. |
| [Kokoro 82M](https://huggingface.co/hexgrad/Kokoro-82M) | Model card and local usage; example emits 24 kHz audio, making mastering interpretation relevant. |
| [Fish Audio S2 Pro](https://huggingface.co/fishaudio/s2-pro) | Model capability and licensing pointer; commercial use terms need separate review. |
| [Qwen3 ASR](https://github.com/QwenLM/Qwen3-ASR) | ASR and separate forced-aligner documentation; aligner limit is up to five minutes, not a claim about every ASR mode. |
| [WhisperX](https://github.com/m-bain/whisperX) | Transcription/alignment implementation and documented limitations. |
| [NeMo text processing](https://github.com/NVIDIA/NeMo-text-processing) | Normalization and inverse-normalization foundation. |
| [DAISY Pipeline conversion](https://daisy.github.io/pipeline/Get-Help/User-Guide/Scripts/dtbook-to-daisy3/) | DTBook-to-DAISY3 options; its stated input is 2005-3 DTBook. |

These sources document options to evaluate. They do not establish NLS acceptance or benchmark results for this project.

## Historical integration evidence and AWS options

[Hindenburg's NLS encoder support article](https://hindenburg.uservoice.com/knowledgebase/articles/1851514-narrator-nls-export-problem-could-not-locate-a) and [APH Book Wizard's revision history](https://tech.aph.org/bwp_new.htm) show previous integration with NLS components. They do not confirm current availability, supported operating systems, redistribution terms or cloud deployment.

[AWS Batch GPU jobs](https://docs.aws.amazon.com/batch/latest/userguide/gpu-jobs.html) and [Step Functions with Batch](https://docs.aws.amazon.com/step-functions/latest/dg/connect-batch.html) document orchestration options. The Library's approved environment and actual workloads determine whether those options fit.

## What changed from the original analysis

The wiki reorganizes the analysis into linked topics and adds explanation rather than treating every recommendation as a requirement. Source review added resource-audio timing exceptions, WAV-relative timing semantics, exact attached-edition limits, draft milestones, support/warranty terms, a missing-specifications list, the live mastering edition, and the distinction between S3 staging and the public Transfer Portal.

The original analysis remains available unchanged for comparison. No benchmark, cost quote, accepted architecture, contract interpretation or playback demonstration has been added as a claimed result.