1972 Census of Wholesale Trade: Subject series: S-1. Establishment size and firm size (including legal form of organization). S-2. Petroleum bulk stations and terminals. S-3. Value produced, capital expenditures, fixed assets, rental payments, and supplemental labor costs of merchant wholesalers. S-4. Subject statistics: sales by class of customer; credit sales, receivables, and bad-debt losses; warehouse space; and other subjects