--- 1972-75

World Championship Interzonals : Leningrad and Petropolis 1973 by Wade, Blackstock, and Kotov, has an appendix 'How They Qualified' (p.282) with full crosstables for all zonals. For some zones, the book also explains how certain players qualified into the zonal.

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1 Caorle 1972-00

BCM, 1972-09, p.329

Scaccomato, 1972-09, p.249

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2 Helsinki 1972-00

Tidskrift för Schach, 1972-09, p.210

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3 Vrnjacka Banja 1972-00

BCM, 1972-06, p.212

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4 Baku 1972-11

http://members.aol.com/graemecree/chesschamps/ussr/ussr40.htm

Wade, Blackstock, and Kotov

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5 New York 1972-00

http://members.aol.com/graemecree/chesschamps/us/1972.htm

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6 Toronto 1972-00

Wade, Blackstock, and Kotov

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7 Bogota 1972-00

BCM, 1972-09, p.329

Wade, Blackstock, and Kotov

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8 Sao Paulo 1972-00

BCM, 1972-09, p.329

Schach-Echo, 1972-08/I, p.236

Wade, Blackstock, and Kotov

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9 Teheran 1972-05

Schach-Echo, 1972-06/II, p.187

Wade, Blackstock, and Kotov

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10 Hong Kong 1972-00

BCM, 1973-01, p.37

Wade, Blackstock, and Kotov