This booklet, Version 1.3, replaces Version 1.1. These electronic file record structures will be used by software developers and utilities to develop computer-generated reports which meet the requirements of 40 CFR Part 75. Electronic Report Record Types (Table 1) provides an index which lists all the possible record types which may be submitted in an electronic report. Tables 2, 3, and 4 define the specific computerized layout or 'record structures' of the electronic reports, containing the following types of data; Quarterly Emission Data (Table 2), Monitoring Plan Data (Table 3), and Certification-QA/QC Test Data (Table 4). Tables 2, 3, and 4 provide the record structures which define the order, length, and placement of information with the electronic report or 'file'. Specifically, the Tables provide the Record Type, Type Code, Start Column, Data Element Description, Units, Range, Length, and Fortran (FTN) Format for each data element in the electronic report.