This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

This subseries includes the service records of many Copper Range Railroad Company employees in two overlapping sets of index cards (1900-1937 and 1902-1967). Additional service record books and files provide further coverage of varying degrees of comprehensiveness, particularly of the Mechanical Department. Earnings records, insurance records, medical records, and seniority rosters are also included in this subseries.

In addition to Railroad Retirement Board regulations, this subseries includes assorted correspondence and forms, which often provide employment dates and death notices. The transmittals are more organized and complete than the letter files but only cover up to 1937. Least detailed, but most comprehensive, are the CER-1 registration forms.