I think the mating season is still lingering, so howlingshould work. However, coyotes could come to any of the calls you mentioned. It's a little early for fawns, but that doesn't mean they won't come to a fawn in distress. I've called up coyotes with several critter distress type calls from critters we don't even have.

Squeakers are great to have, but they don't have a lot of volume. When I first start at a set, I squeak just to check and make sure nothing's close that I'm going to startle or scare away. I also squeak when I am nearly finished at a set, just to make sure anything that is on it's way and is nearly to mehas had the opportunity to show. Squeakers are also handy if a coyote starts to hang up when he is getting in range, or when one won't hold still for a shot. Sometimes a squeak will get just enough reaction to make one pause for a shot.