Yukon Cornelius

The puzzle asked for four separate answers that when taken together are items required by a certain explorer.

1.  The first clue asks for four two letter abbreviations.  Sending a letter via third party is “care of” or “CO”; a medical degree is, in this case, “RN”; the Pine Tree State is Maine or “ME”; and atomic number 13 is Aluminum or “AL.”  Place these together to form the word Cornmeal.

2.  These three ingredients can be mixed together to make Gunpowder.

3.  The two definitions that start with the same letter are:  a.) lamb; and b.) lox.  Change the starting letters to an “H” and put the new words together to get Hamhocks.

4.  Each mini rebus puzzle refers to a word.  The first puzzle starts with a gift, from which the “F” is eliminated and an “R” is added to the end.  Sounding it out (git-r) gives Guitar.  The second word begins with a picture of Remington Steele.  Take Steele and subtract the eel of the following picture, leaves the “St” sound.  Add this to the front of the telephone ringing, to get Strings.

The four words are Cornmeal, Gunpowder, Hamhocks, and Guitar Strings.
Plugging these four items into a search engine, or if you just happen to know, reveal that one explorer requires these (in his words) “life sustaining supplies.”  That singing prospector, famed for seeking silver and gold, oddly licking his pickaxe, reforming the Abominable Snow Monster, and for being part of the 1964 stop-motion animated Christmas special Rudolph the Red-Nosed Reindeer is the great Yukon Cornelius.