The state totals given here are the sums of the individual county results. They do not match the totals given in the source (602,648 for Mandel and 346,449 for Gore).
Source for Popular Vote data: Maryland State Archives . Maryland Manual, 1975-76, Volume 177, Page 243, Maryland State Archives (http://www.msa.md.gov/megafile/msa/speccol/sc2900/sc2908/000001/000177/html/am177--243.html) (accessed 27 Oct 2012)