1.

図書
図書
1. Plane and solid geometry
by William Betz and Harrison E. Webb ; with the editorial coöperation of Percey F. Smith
出版情報: Boston : Ginn, c1916
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2.

図書
図書
2. Basic mathematics : a self-teaching course (Course 1 ; Course 2)
[by William Betz]
出版情報: [Boston] : Published for the U.S. Armed Forces Institute by Ginn, c1944
シリーズ名: War Department education manual ; EM 308-309
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