záznamy č. 1-2/2

#1	Operating engineer : operation and maintenance of the power services. -- Spojené státy americké : New York : McGraw-Hill, 1947-1951
#2	Power : the magazine of power-generation technology. -- New York : Hill, 1911-. -- ISSN 0032-5929 print. -- ISSN 1936-7791 online