GS Calibration X GA ANWX NT X Frequency calibration for the 60 ips recordings on Ampex. DA 8-Jan-1991 GB Nonamesset Is. Pond, MA X AU WES LO Shiv RG AX-58 Hydrophone ; WHOI suitcase amplifier ; Ampex recorder, 29-SEP-1955

The Sound Recordings series contains reel-to-reel, cassette tape, digital audio tape (DAT), and compact disc sound recordings of marine mammals created or collected by Watkins. Tape descriptions are taken from a database of the tapes, and include coded fields for description. See the collection Scope and Content note for a list of codes. Several tapes came with notes or correspondence; the material was foldered and is filed by recording number in box 4, and cross-references to the material are noted in the recording descriptions.