These data tables were scanned by Fiona Gleadow. The data relate to diving petrels (Pelecanoides) from Heard Island, and generally appear to be measurements of body parts (weight, wing, tail, beak, tarsus, toe) on males and females, as well as measurements of eggs (weight, length and width).
The dates that these data were collected is unknown. At a guess, it would be somewhere between 1948 and 1960, and most likely around 1951 (as these documents have been grouped with a large number of other documents dating from 1948-1951).
The scanned data are available for download from the provided URL.