The Geology of the Eastern End of Essex (Walton Naze and Harwich). Explanation of Quarter Sheet 48 S. E. with the Adjoining Part of 48 N. E.)William Whitaker1877
Beitrag zur Bestimmung der physischen Libration des Mondes aus Beobachtungen am Strassburger Heliometer / von E. Hartwig.Ernst Hartwig1881DE
The Onéota; from notes and memoranda written down by Willard E. Yager prior to his death. Edited by Douglas Earl Bailey. Sponsored by Hartwick College, Oneonta, N.Y.Willard E. Yager1961
