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- Cooperation : principles and practices / The Department of supervisors and Directors of Instruction of the National Education Association. eleventh yearbook . Washington, D.C. : Department of Supervisors and Directors of Instruction of the National Education Association, 1938 . 244 s . [1, currently available 1]
Branch Inaccesible Available Issued Reserved Univerzitní knihovna UHK 0 1 0 0 
book