Russel, H.R., World War I
Hubble's Variable Nebula (N.G.C. 2261)
Letter from Henry Norris Russell (Princeton University) to Carl O. Lampland, February 9, 1918, 1918-02-09
Thanks for slides Lampland sent of nebulae
Slide of N.G.C. 2261 (Hubble's Variable Nebula) is by far the best illustration of its extraordinary…
Lampland, C.O., Solar Eclipse Expeditions
World War I
Letter from Carl O. Lampland to John A. Miller (Vice President, Swarthmore College), November 1, 1917, 1917-11-01
Visit by Mrs. Lowell and Trustee, Guy Lowell
Photographic doublet needed to continue the transneptunian work and preparations for the eclipse…
Barringer, Daniel M., Jr., Meteor Crater
Affects of the Great Depression
Letter from Daniel M. Barringer, Jr. to Carl Lampland, March 14, 1933, 1933-03-14
Papers on Meteor Crater
Odessa crater
Richard Barringer
The hard economic times have made it necessary to discontinue explorations at the…
Barringer, Daniel M., Jr., Meteor Crater
Affects of the Great Depression
Letter from Daniel M. Barringer, Jr. to Carl Lampland, July 5, 1931, 1931-07-05
Daniel M. Barringer, Jr.'s article on Meteor Crater in Scientific American
Exploration work at Meteor Crater temporarily suspended due to the…