According to the WorldCat page on "Mastering Japanese", the course is composed of sound recordings and the book "Beginning Japanese" written by Eleanor Harz Jorden. While the sound recordings may have been created by the Foreign Service Institue, the book is most certainly copyrighted. The book was published by Yale University Press and the copyright renewed on 1990-01-12. Eleanor Harz Jorden, who also wrote the FSI Vietnamese courses, died in 2009.
A later companion book "Reading Japanese" by Jorden is in the public domain and the full text is available (at least in the US) from google books:
http://books.google.com/books?id=1MF6kC ... &q&f=falseThe book contains katakana, hiragana, and kanji with stroke order diagrams and plenty of sample sentences. I wouldn't be surprised if someone has already produced software flashcards from it (i.e.
http://en.wikipedia.org/wiki/Anki) Note that some of the kanji characters forms have been changed (reformed) since the printing of the book.
But why use a 1963 textbook when the same author has a later 1987 course "Japanese, The Spoken Language" (JSL) with new audio files available online at Ohio State University? The co-author (Mari Noda) is currently a professor and the chair of the Department of East Asian Languages and Literatures. Unlike the other languages at OSU, there is explicitly no login required to access the files. Ostensibly, non-students are free to use the files, though they are copyrighted. If there is any concern, you may wish to send an email and inquire with the professor. There is also audio and a special web page for "Japanese, The Written Language" (JWL).
http://deall.osu.edu/resources/default.cfm (See the last two bullets in "DEALL-Hosted Home Pages")
http://languagelab.it.ohio-state.edu/ (note the "No Login Required")
The books Vols 1-3 of JSL can be found used for about $10-$20 each. Each book took around two semesters to complete when combined with the written book. When I took the course, we had two 50 minutes lectures and five 50 minutes recitals per week. It was expected that the student would spend at least an equal amount of time outside the class reviewing materials and listening to audio, so 10 hours or more a week were needed. For under $50 or so, one could have three years of full time college material.
Typical Lesson Plan:
The student was required to memorize the lesson dialogue and be able to play either part in class. The lesson also included new vocabulary relating to the dialogue. For example, after making sure each student knew the dialogue, the TA would set up scenarios where the students would need to plug in new words. If the dialogue involved asking the price for a blue umbrella, the TA might hold up a yellow pencil. The student would need to quickly recall the Japanese words for "yellow" and pencil. I still get knots in my stomach just thinking about it.