Day & Zimmermann

• Report no. 2807 on the properties of cinder concrete building units to National building units corporation of Philadelphia, Pennsylvania ...
• Metropolitan Rapid Transit Commission
• New England's power resources
• On the properties of cinder concrete building units to National building units corporation of Philadelphia, Pennsylvania
• Potential near term improvements in urban transportation
• Power survey for the Kingdom of Laos
• Report no. 5849-A to Metropolitan Rapid Transit Commission
• Report no. 5849-B1 to Metropolitan Rapid Transit Commission
• Report no. 5849-C to Metropolitan Rapid Transit Commission
• Report to the city of New York, Dept. of Traffic
• Report to the Honorable James J. Walker, Mayor, on highway traffic conditions and proposed traffic relief measures for the city of New York