After Ansal Adams passed away John Schaffer (President of the University of Arizona, now retired, who brought Ansal Adams and Eugene Smith's negatives to the U of A Center for Creative Photography) brought out several texts which were called The Ansal Adams guides to Photography Basics with updated information. I think that Schaffer keep true to Ansal Adams ideas. But there are many good texts, just by browsing on E Bay you can get an idea of the makes and models of enlargers are available and get recommendations from users before you buy. Look for good lens, no matter what the make of an enlarger is without good lens it doesn't matter.