Egypt. The Great Pyramid (Dynasty IV): Cross-Section Drawing. From Piazzi Smyth's "Our Inheritance in the Great Pyramid", n.d.
Smyth, Piazzi (author)
New York State Archives, New York (State). Education Dept. Division of Visual Instruction. Instructional lantern slides, ca. 1856-1939. Series A3045-78, No. 16478.
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