Zero emissions vehicles=A
Books=B
Plaque series in Rome=C
Stems and leaves=D
Red seats to the east=E
Trappers and frontiersmen=F
Final coordinates: N 41 45.ABC W 111 50.DEF
You can check your answers for this puzzle on GeoChecker.com.
You can also test the values with this checksum: A+B+C+D+E+F=29
Congratulations to McMiF for FTF on their first puzzle cache!