Table 1.  Summary of individual data sources.
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Original data  Where keypunch  North Pole  Approx. no.
set name (1)   was performed   stations    soundings    Notes
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Floppy         CAO, AARI       3-6,8-9,     20,000      Mostly upper portions
                               12-17,22,26              (> 3km) of soundings

Aerostan       captured via    22,26,28,31   2,000      Obtained from World
               GTS(2)                                   Data Center, Obninsk

Condigital     NCDC            4,5           1,300      Data published in
                                                        Russia (AARI, 1959).
                                                        Recorded in NCDC
                                                        standard format.

3km            AARI            4,6-17,      20,000      Lower portions of
                               19,21-22,26              soundings (0-3km)

Books          UWM             6,7             700      Data published
                                                        in Russia 
                                                        (AARI, 1960; 1962).
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(1) The original data set name is arbitrary, used for identification
    purposes only.
(2) Global Telecommunications System
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