H Helm Clayton

H Helm Clayton is the author of "Annals of the Astronomical Observatory of Harvard College V43", "Smithsonian Miscellaneous Collections", "World Weather Records 1921-1930" and "World Weather Records, 1931-1940".

Books by H Helm Clayton

Annals of the Ast...
Clayton, H. Helm
Hardback: $42.95

Smithsonian Misce...
Clayton, H. Helm
Hardback: $45.99

Observations Made...
Clayton, H. Helm
Paperback: $28.75

World Weather Rec...
Clayton, H. Helm
Hardback: $37.59