Wheeler Survey field notebook: triangulation; topographical records Image Read more about Wheeler Survey field notebook: triangulation; topographical records
Wheeler Survey field notebook no. 30: sextant astronomical observations Image Read more about Wheeler Survey field notebook no. 30: sextant astronomical observations
Wheeler Survey field notebook no. 6: reconnaissance; surveys for military defenses Image Read more about Wheeler Survey field notebook no. 6: reconnaissance; surveys for military defenses
Wheeler Survey field notebook no. 29: sextant astronomical observations Image Read more about Wheeler Survey field notebook no. 29: sextant astronomical observations
Wheeler Survey field notebook no. 86: meteorological records Image Read more about Wheeler Survey field notebook no. 86: meteorological records
Wheeler Survey field notebook no. 84: meteorological records Image Read more about Wheeler Survey field notebook no. 84: meteorological records
Wheeler Survey field notebook no. 34: triangulation; topographical records Image Read more about Wheeler Survey field notebook no. 34: triangulation; topographical records
Wheeler Survey field notebook no. 225: topographical records; time record; current observations Image Read more about Wheeler Survey field notebook no. 225: topographical records; time record; current observations
Wheeler Survey field notebook no. 203: topographical records Image Read more about Wheeler Survey field notebook no. 203: topographical records