You can go the dark, green leafy vegetable route as well BUT, in order to absorb the iron better you have to not have dairy for 4-6 hours afterwards and have a source of vitamin C (couple of ounces of orange juice or tomatoes/juice). Another is fortied cereal. Most boxed cereals have iron and so do nuts (particularly almonds). Wheat germ too (and its also a good source of natural folate and vitamin E).
Also moderate to rigorous exercise as you need red blood cells to deliver oxygen to the body and it does help build up the blood.
Or - go visit Mel Gordon in Denver because living in higher altitudes (thinner air) makes you build more red cells
Also, your reading is a good reading. Anyone with 11 or better can give blood so yours is good.