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In the screenshot below (table 5), the first character in the 00 position is ‘c’, indicating it is an electronic resource. Clicking on details for 'electronic resource', we see that the second character (in the 01 position) is ‘r’,  which indicates it is a remote resource. The fourth charater (in the 03 position) refers to 'color', adn teh and the value 'n' indicates 'non-applicable'. 

Table 5.

For a brief description of all fields including fields with indicators, please see the MARC documentation 'Understanding MARC'.