Wilber, D. N ... Depicts the following; Plan; Elevation; State Overlay of elevation points for '17' ... 1932
Wilber, D. N ... Depicts the following; Plan; State ... 1932
Wilber, D. N ... Depicts the following; Plan; Sketch Trace sketch of '17' ... 1932
Athena trench ... N/A ... Depicts the following; Plan; State ... N/A