From the introduction: "The following notes deal with the way in which we handled the monolingual language-learning situation on the Indian Protection Service (S.P.I.) Post of Simoes Lopes, Mato Grosso, the pitfalls we found, and what we would do differently should we be starting afresh."
McLeod, Ruth A.
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 5, Article 11.
Available at: https://commons.und.edu/sil-work-papers/vol5/iss1/11