Wednesday, September 2, 2009

Harlow Shapley

"The Scale of the Universe"

by

Harlow Shapley

Bulletin of the National Research Council

Volume 2

Part 3

Number 11

May 1921

[Click individual pages to enlarge for reading]
























Heber Curtis

"Dimensions and Structure of the Galaxy"

by


Heber Curtis


Bulletin of the National Research Council


Volume 2


Part 3

Number 11


May 1921


[Click individual pages to enlarge for reading]