These are the intermediate records completed by the field assessors for taxation purposes which are arranged internally by streets and contain generally the same information as the tax books (RG. 4, Series 1). The main difference is that internal arrangement and field assessors' records often contain modifications and corrections. These records were probably maintained by the Commissioners of Tax for Baltimore City, appointed for periodic reassessments. The creation of the Appeal Tax Court (RG.5) in 1841 (and its successor the Department of Assessments in 1934) mainatianed similar volumes. The records of the Appeal Tax Court are different in that they are the rough workbooks carried into the field by the assessors (RG.5, Series 2). The records listed below are apparently the final copies of these workbooks, including changes and a partial listing of alphabetical name indexes. The tax books (RG.4, series 1) are the final records based on the work of the field assessors and reviewed by the various bodies authorized to do so. Researchers should plan to examine all three record series for research into the general property taxation system of Baltimore. Nearly all the volumes listed below contain alphabetical name indexes. Other variations have been noted where appropriate. These records are restricted to microfilm; the BCA number following the description is the microfilm reel number.