Logo      P and I International. Vol 4 (1990) / editor Bill Robertson
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    01 / Vol 4, No. 1 (January 1990)
    02 / Vol 4, No. 2 (February 1990)
    03 / Vol 4, No. 3 (March 1990)
    04 / Vol 4, No. 4 (April 1990)
    05 / Vol 4, No. 5 (May 1990)
    06 / Vol 4, No. 6 (June 1990)
    07 / Vol 4, No. 7 (July 1990)
    08 / Vol 4, No. 8 (August 1990)
    09 / Vol 4, No. 9 (September 1990)
    10 / Vol 4, No. 10 (October 1990)
    11 / Vol 4, No. 11 (November 1990)
    12 / Vol 4, No. 12 (December 1990)