Codes used in descriptions of MC-78: William A. Watkins collection of marine mammal sound recordings 

    CU: Cue or time (min:sec) on tape at signal end
    NC: Number of channels recorded
    SR: Sample rate
    CS: Cut size - seconds
    PL: Playback recorder/filter type, settings in kHz
    SC: Signal class, letter codes:Signature, Mimic, Variant, Deletion, Uncharacteristic, Calf, etc.
    ID: Identification of vocal animal, species code
    AG: Age, sex prefix (M or F), birth year of vocalizing animal
    IA: Interaction, male-male (MM)/female-calf (FC), etc., with ID's
    GS: Genus and species of vocalizing animal
    GA: Geographic location A, geographic area code from ASFIS (Aquatic Sciences and Fisheries Information System) map, species code
    NT: Note; species code, comments, recording details
    DA: Date of the record entry, last modification of database entry
    IP: ID of conspecifics present, species code
    AP: Age of conspecifics present - sex prefix with age and ID
    BH: Behavior codes, species code
    OS: Other species present, species code
    NA: Number of animals vocalizing, species code
    GB: Geographic location B
    GC: Geographic location C, latitude and longitude
    OT: Observation time for original, species code
    SH: Ship/cruise, aquarium or other platform
    AU: Author,originator of the recording
    HY: Hydrophone depth in meters
    RC: Conditions, weather, salinity
    RG: Recording gear
    RB: Recording bandwith, lowest and highest kHz
    SL: Signal level, Received, Source, species code
    ST: Signal type
    TD: Time duration
    TS: Time signal duration
    TC: Time duty cycle (area/peak)
    TA: Time amplitude variable (attack and decay)
    FR: Frequency reference center (aggregate)
    FB: Frequency bandwith (aggregate)
    FI: Frequency instantaneous average (binsize)
    FT: Frequency trends
    FS: Frequency skew
    SP: Signal pattern of occurrence, repetition