Betty Ellen Cox (1918-2012) was a missionary of the American Free Methodist Church who spent 42 years in Burundi and Rwanda.
Here is her curriculum (and obituary) of the FMC. Towards the end of her stay in Rwanda (1986) she edited, together with F. Gakuba,
the "Kinyarwanda Lessons" which can be found in the internet. They represent a well understandable language course in 125 lessons,
with an easy-going introduction into the grammar and many examples. With M. Adamson and M. Teusink she had also written a
Dictionary "Kinyarwanda-English, English-Kinyarwanda (published by the FMC in the internet in 2008).

M. Brack has edited Cox' "Kinyarwanda Lessons", correcting obvious mistakes, introducing the phonetic notation of vowels in the
vocaublaries and parts of the grammar, and added three introductory lessons: A. Categories of the universe and nominal classes,
B. Concepts of time and verb conjugation, and C. Special vocabularies.

You may download the "Cox Lessons with additions by M. Brack" (2016) in four zipped packages of four PDF files each (version 2016):

CL_1.zip (Lesson 0: Title, contents and introduction, and Lessons A, B, C)

CL_2.zip (Lessons 1-10, 11-20, 21-30, 31-40)

CL_3.zip (Lessons 41-50, 51-60, 61-70, 71-80)

CL_4.zip (Lessons 81-90, 91-100, 101-110, 111-125)

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There are certainly still misprints and other errors. Feed-back to matthias.brack@ur.de is welcome!
Revised parts might be added occasionally and indicated above.

(last update: 26.10.2021, MB)