"Film continues to be the best way to store visual information about architecture and engineering for the long term, which is why it is still the standard in the HABS, HAER, and HALS collections. Photographs taken and printed for HABS, HAER, or HALS, in accordance with the Secretarys Standards are made from large-format, black and white film. The images are perspective corrected in the field at the time of capture using a view camera. Large-format (4x5, 5x7, and 8x10) refers to the size of the negative in inches, not the print.
The large-format negative is preferred for two reasons: longevity of the film and clarity of the image. The material stability of cut sheet film satisfies the archival requirements for longevity ....." ETC