Chapter 1 of 6 · 31 words · ~1 min read

book 2. By Leo J. Brueckner, C. J.

Anderson, G. O. Banting & Elda L. Merton. Special state ed. © on revisions & additions; 29Aug34; A77326. Holt. Rinehart & Winston, Inc. (PWH); 18Jul62; R298219.

The triangle arithmetics. Grade 7,