The 1921 Biennial Census of Manufactures was issued in two volumes.
Tables specifically about New York are highlighted. Specific industry tables generally include summary data by state.
Biennial Census of Manufactures. HD 9724 .Un31 - Business
Includes chapters on: General Explanations; General Summary; Individual Industries, by Industrial Groups; Summary by Industries and States; Monthly Employment of Wage Earners; Hours of Labor; Establishment Classification According to Size; Actual Output in Relation to Maximum Possible Output. New York State - p. 1452-1460
New York City - p. 1563-1567
Census of Manufactures: 1921. Summary by Industries. 317.3 Un7433 - Offsite