TY  - RPRT
TI  - Topography and topographers: Yesterday, to-day to-morrow: Fiftieth anniversary
AU  - E.I. Ireland
AU  - Gerald Fitzgerald
PY  - 1929
DO  - 10.3133/70216527
UR  - https://pubs.usgs.gov/publication/70216527
ID  - 70216527
ER  -