Below is a clickable map taken from the USGS map coverage index for the State of Missouri, followed by a list of 24k DRG quad numbers. Alternatively you can view an alphabetical listing of DRGs.
To find the 7.5 minute quadrangle that you need, click the 1degree by 1 degree lat/long block which will take you to a more detailed map showing the 64 7.5 minute quads for that lat/long block. From there, simply identify the quad you want and click the text link for it to download the file.
The original data were projected in NAD27 and were reprojected as NAD83
NOTE: The three files you need are now zipped together into one file for faster download and you will need to unzip it. Please see the GZIP Help Page if you are having trouble.
The original data were projected in NAD27 and was reprojected as NAD83
The directory location of these files is: ftp://msdis.missouri.edu/pub/Imagery_Base_Maps/drg/