I never said, I didn't know what I was doing. I know what I'm doing, but was simply asking if there are other exercises besides lat pulldowns that can work the back. I could probably figure out what the exercise is by the name, but a description never hurts, so that's why I asked. The gym I go to is at my college, and I'm not taking a class there, I just signed up for the pass. A PT would be unreasonably expensive for me right now, and probably unnecessary since I'm only looking for a few other specific exercises rather than trying to figure out how every piece of equipment in the gym works.
Edit-I checked out the links, and it looks like mostly rowing exercises. Which is just the information I was looking for, thanks for providing the link LeiYunFat, everyone else's advice is appreciated, however I know how rowing exercises work, so I shouldn't have to worry about injury as long as I'm exercising safely and correctly.