Ozish

Bibliography

First the two pricey sources.

O'Reilly, Irish-English Dictionary, 1817 and again in 1821 and 1864. One of the two dictionaries that Baum probably used.  ($750 to $1000)

Wagner, Linguistic Atlas and Survey of Irish Dialects. 4 volumes 1958 to 1969. This is the nearest thing to a real compendium of Irish Gaelic as it was spoken in the 1800s. Pronunciation of words and lots of phrases and stories, all collected from people who had to remember how they spoke the language 40 some years previously. As the editor says, this is not the record of a dying language, but the record of the ruins of a language that used to exist. ($500)

The rest of these are what's relevant, reasonably available and not too pricey. They represent Gaelic old and new.

Bhaldraithe, English/Irish Dictionary, 1959, this is the modern standard

Buck, A Dictionary of Selected Synonyms in the Principal Indo-European Languages, 1949

Calder, Auraicept na n-Eces, The Scholars' Primer, 1917, in English and Irish.

Collins Gem English/Irish Irish/English Dictionary, 1995

Dillon/Coinin, Teach Yourself Irish, 1961, my recommendation for starters, it has basic modern grammar and a glossary with pronunciations. Worth its weight in gold that.

Dinneen, School edition English/Irish Dictionary, 1967, modernized

Dinneen, Irish/English Dictionary, 1927, this is the bible
    If you get only one Irish/English Dictionary this would be the one. Dineen actually spoke Gaelic, so this dictionary is a good representation of Irish in the late 1800s. On the other hand he left out everything from previous dictionaries that didn't fit his mindset, so it's nowhere near complete in any sense. And like practically every other Irish dictionary it has no pronunciations.

Dinneen, Irish/English Dictionary, 1909, totally included in the 1927 version
    Some of the comments are better than in the 1927 version

Gregor, Celtic - A Comparative Study, 1980, excellent for history and language

Jackson, Contributions to the Study of Manx Phonology, 1955

Lane's, English/Irish Dictionary, 1904

Lane's, Larger English/Irish Dictionary, undated, 1920s?

Lehmann, An Introduction to Old Irish, 1975, superb and relevant till 1900

MacAlister, Corpus Inscriptionum Insularum Celticarum, vol 1, 1945

Macbain, Etymological Dictionary of Scottish-Gaelic, 1896, still in print! and one of the two dictionaries Baum probably used.

Mackinnon, Teach Yourself Gaelic, 1971, Scottish

O'Flaherty, Ogygia, 1793, available in facsimile, amazing sourcebook for some of the major misconceptions about the history of the Irish language that are in common currency today

Purdon, The Story of the Irish Language, 1999, somewhat optimistic re the number of speakers, 10% fluent rather than the more likely 1%. Otherwise a good history.

Thurneysen, Handbuch des Altirischen, 1909, if you read German

Thurneysen, A Grammar of Old Irish, 1946, if you don't read German