Hint #1: the meta will be easier if you've played the computer game "Oregon Trail"... if not, then lean heavily on the google machine
Hint #2: 68-A "I'll be crossing you in style"... but what are we crossing?
Hint #3: we are crossing rivers, the four rivers that appear in the game "Oregon Trail" in order are: Kansas River, Big Blue River, Green River, and Snake River
Hint #4: in the game, when you cross a river, you have several options to choose from such as taking a ferry, or hiring a Native American guide...
Hint #5: find the letters of intersection between the entries with the river names in them and the entries with the crossing methods in them