These are eighteen letters that mostly concern Indian linguistics. Regarding Zeisberger's Onondaga grammar and dictionary; Heckewelder's writings on the Indians; publications; question of whether or not any of the Lenape can pronounce the letter "r."

From 1735 to 1762, Antoine-Simon Maillard (d.1762) was a Catholic missionary to the Micmac Indians at Restigouche on the Gaspé Peninsula, Quebec. Abbé Maillard was the first Frenchman to master the Micmac language, and he collected extensive grammatical and linguistic notes which were edited, arranged, and published by Rev. Joseph M. Bellenger in the 19th century. The "Instructions sue la langue Mickmaque" is a French-language instructional manual on the grammar of the Micmac language, probably compiled by Rev. Joseph M. Bellenger, ca.1814. The manuscript (identified as Phillips 12343) is based on the grammar of Abbé Maillard, and is arranged on a Latin model. It includes general comments on the structure of the language, orthography, nouns, pronouns, and numerals, with more extensive commentary on verb conjugation. The manuscript appears to be incomplete, ending with the section heading "Verbes réciproque."

Susie Enos was a native speaker of Tohono O'Odham and an early writer of her language. She contributed to the construction of a Papago dictionary in 1983. The text collected by Susie Enos from a consultant, Jose Ventura, "Ho'ok Oks" (Witch, Green Hawk, Eagle) includes indications of the syntactic function elements in the sentences and other grammatical notes, with a separate, line-by-line English translation.