[offsides]

To expand on what Bowser said, the original maps were single-piece, since they were paper with ~1/2" hexes. So (e.g.), the G2 map from Battlefields is G2N and G2S in ODE as the large maps had to be split into 2 pieces for size and weight reasons. So in ODE terms Operation Newspaper uses G1N, G1S, S1N and S1S.

As an aside, I love the fact that the split ODE maps actually increase the ways you can geomorph them by using just the S half of one and the N half of another, for a "standard" sized map that's totally "new"... :)