- date(s): 
 - 1915-1927
 - creator(s): 
 - Edwin P. Ambler (Saint Louis, Mo.)
 - subject(s): 
 - Business; Industries; Finance; Contractors; Contract labor; Heating; Heating and ventilation industry
 - place(s): 
 - United States; Missouri; St. Louis City, St. Louis
 - type(s): 
 - Ledger; Item