H. D. Welte, F. B. Knight & L. S. Walker.
Experimental geometry tests. No. 1-4.
R573486. Experimental geometry tests. No. 1-4. By H. D. Welte, F. B. Knight & L. S. Walker. © 12Mar47; AA47289. Scott, Foresman and Company (PWH); 29Mar74; R573486.
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