For some stations, gaps exist in the sequential image numbers that are incorporated into image filenames. Image numbers were assigned during the digitization of the film images and their storage on an archival CD-ROM. The sequence of images from some stations was split among two CD-ROMs. This process created gaps in the image numbering sequence for those stations. For example, station 3948 has images numbered 1-17 and 62-100. The first photograph taken at station 3948 was digitized as image number 62 on a CD-ROM, and subsequent images from the station recorded on that CD-ROM were assigned numbers 63 to 100. The remaining images from station 3948 were recorded onto a new CD-ROM as images numbered 1 to 17. When the last photograph from station 3948 was digitized (CD-ROM image 17), a new station's photographs were loaded onto the CD-ROM beginning with image number 18 and so on. In addition, digitized images of tests on deck or blanks caused by a strobe malfunction have not been included in the photo collection.
The filename of each photograph includes a Quadrangle and Station designation. By convention, if the station drifted over the seabed, the location of the Station (lat/lon and Quadrangle number) was recorded at the end of the station. In a few cases, stations extended across Quadrangle boundaries. Filenames for all photographs at these stations incorporate the number of the Quadrangle where the Station ended. The lat/lon coordinates for all individual photographs are geographically correct.