The distinction is kept in the catalogue sign by sign. It exists so that a guess can never quietly become a fact — which is the way a research record decays.

1. ●●●● foundational

   RNIB, Moon Transcribers Instruction Manual, April 1996

   The normative Grade 2 rules, the complete exception list, and §3.4 — the capital indicator's shape

   Likely held by RNIB Research Library, RNIB Archive

2. ●●●○ very high

   The Moon System, Regency Press, Brighton, 1962 — complete

   It already settled the numeral history and the eight base signs from two pages. The rest is likely to settle as much again

   Likely held by RNIB; no copy located. Two pages survive as photographs in Fulas 2021, p. 230

3. ●●●○ very high

   Moon, A Simplified Alphabet for the use of the Blind — an original sheet

   Moon's own instructions at full resolution: the classified alphabet, the star numerals, and whether other editions of the sheet differ

   Likely held by Library Company of Philadelphia; one photograph in Fulas 2021, p. 218

4. ●●●○ very high

   Armenian Moon: Psalms 34 and 86; John, chap. 3; Primer — and Armeno-Turkish Matthew (2 vols)

   The 26 Armenian letters Everson leaves blank

   Likely held by Unknown. Listed in Rutherfurd 1898, Appendix D; John 3 was circulating in Anatolia by January 1865 through Dr Riggs of Constantinople, so mission collections are the trail

5. ●●●○ very high

   Portuguese John, chap. 3

   Whether Portuguese Moon marked accents, and whether it contracted anything

   Likely held by Unknown. Listed in the same two catalogues; c. 1850–1873

6. ●●●○ very high

   Cryer, Home & Wilkins, User Requirements for Moon, RNIB, 2011

   What teachers and specialists said Moon readers actually need

   Likely held by RNIB. Known only from a later citation; request it with item 1

7. ●●●○ very high

   The Moon Magazine, vol. 86 no. 5, May 1927 — the complete issue

   Many pages of running text instead of one, to test the contraction rules against

   Likely held by RNIB Archive, British Library, Perkins — and US libraries received it monthly into the 1940s

8. ●●●○ very high

   Clean Duxbury English/Moon output, outside demo mode

   Whether seven candidate contractions found in its tables are real rules

   Likely held by Any licensed user, or Duxbury Systems; the corpus to run is in duxbury-mac-inspection.md

9. ●●○○ high

   Possum Moon-Writer User's Handbook (draft, with tactile graphics)

   Whether the ss05 letterforms and their stroke order are right

   Likely held by The Dot Experience, formerly the APH Museum, accession 1992.359. A Perkins Archive photograph shows the machine

10. ●●○○ high

    Campbell, The Gospel of Matthew Adapted for Blind Readers on the Island of Formosa, 1888

    The complete Revised Moon alphabet and its seven tone marks

    Likely held by University of Glasgow Special Collections; one page is reproduced in Chiu 2023

Four filled circles means the whole project is waiting on it; three means it would settle a lot. The full queue, what has already been read, and which searches came back empty are in the material tracker.

• Nobody has read it by touch. There has been no test with a Moon reader and no test on a machine that presses paper. The sizes follow published advice, not measurement.
• Moon is not in Unicode. The font uses the Latin alphabet, and also the code points of a 2011 proposal that was never approved. The roadmap has since moved the space it would occupy.
• Some signs are guesses. Where no document could be found, the catalogue and the font manual say so, sign by sign.
• The official Grade 2 manual is not public. What is here comes from the documents that are public, and from the printed page the rules are tested against. Parts of the manual survive inside other people’s software; that is not the same as having read it.
• This is not certified transcription. A font sees letters, not meanings. For a document that has to be right, use dedicated transcription software and keep the source text.