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)