The Hanna IV test, scheduled for late 1977, was delayed due to severe weather. Starting in April 1978, monitoring was conducted over a seven week period. The test burn was terminated because of unfavorable burn conditions along the top of the coal seam. The results of the Hanna II monitoring were reported to LETC in the final report. Data from Hanna IVA was presented in an interim report to LETC in August, 1978. The purpose of this report is to present data from the Hanna IVA and IVB monitoring periods and to present average test results for 3 monitoring periods for comparison. Included in the characterization of the well-head production gas are physical characteristics.