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]

Shapley and Curtis documents on the universe--1921

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]

Shapley and Curtis documents on the universe--1921