Is there a way to remove maps?

Mistakenly bought a 100K topo map for the additional coloring to spice up my Tactix Delta Sloar. To my naive surprise there is no additional color or advantage for the purchase. Since there was no difference I kept trying to download it thinking I had performed the task wrong, big mistake. After fooling around with all my download attempts GE downloaded an additional standard topo, same label but no content. Now I have two topo's labeled the same, one that works and one that doesn't. Can I some how delete that blank topo?

To Garmin's credit, they refunded me the purchase price of the 100K topo.