It is possible to use these tables to find Minutes, Seconds, and Tenths of Seconds from Decimal Coordinates by subtracting.  Find the decimal in the Minutes table that is equal to or less than your decimal coordinate, and subtract that decimal from your decimal, recording the Minutes equivalent to the decimal subtracted.  Now, find in the Seconds table, the decimal equal to or less than the remainder from Minutes, recording the Seconds and subtracting the seconds decimal.  If there is still a remainder, find the nearest Tenths of Seconds to the remainder from Seconds and record.  The errors should be similar to those above in converting to Decimals.

Note:  DD.DDDDD is slightly more accurate than DD MM.MMM (fractional minutes may be found by dividing seconds by 60) which itself  is slightly more accurate than DD MM SS.S and DD MM SS is even less accurate.  DD=degrees  MM=minutes  SS=seconds  Here are approximate values:
Latitude:  3.64 feet per 0.00001 degree, 6.06 feet per 0.001 minute, 10.10 feet per 0.1 second, 101.1 feet per second, 6066.7 feet per minute.
Longitude:  3.04 feet per 0.00001 degree, 5.07 feet per 0.001 minute, 8.45 feet per 0.1 second, 84.5 feet per second, 5066.7 feet per minute.
Minutes and Seconds to fractions:  00'00"=.00000  07'30"=.12500  15'00"=.25000  22'30"=.37500  30'00"=.50000  37'30"=.62500  45'00"=.75000 52'30"=.87500

Cemeteries are listed with the name of the USGS 7.5 degree map on which it would be located, if this is known.
The names of USGS 7.5 degree maps for Mississippi counties may be found using coordinates at http://MSGen.net/ms/mapsn.html .
The coordinates of USGS 7.5 degree maps for Mississippi counties may be found using names at http://MSGen.net/ms/mapsa.html .

If you happen to be researching out west, there is a site that makes Township-Range-Section conversions to/from latitude-longitude:  Legal location (Township-Range-Section) to Latitude/Longitude conversions for western US  and a guide to the Principal Meridians and Base Lines governing US public land surveys.