Sounds like we are starting to get off topic here. The topic here is where can I learn card control, not who is the more well read magician. I think we can all agree that every beginner should at least attempt to work through S.W. Erdnase. It was written over a hundred years ago an d the illustrations are not the best but a good chunk of what you will find in any beginner's resource is merely an attempt to explain Erdnase in more modern vernacular with perhaps better illustrations. The book went into the public domain a few years back and if you do a google search for "S.W. Erdnase, Expert at the Card Table" you should be able to find a free download. From there you can get a good idea of what card control and manipulation is all about and start cherry picking other books and DVDs that you think will help you on your journey. There are many options to choose from once you get past Erdnase, RRTCM, Card College, Born to Perform, Darryl's Encyclopedia of Card Sleight, Etc, Etc but the one thing that every single one of the great card men of 20th century had in common. Vernon, Marlo, Miller, Hugard & Braue, Giobbi, Tamariz...they ALL studied their Erdnase. What do you have to lose? It's FREE
Here is the biggest problem with "Expert at The Card Table"... it is a difficult read for most of today's young readers and beginners. I believe EATCT can be understood by those who are in the intermediate/advanced phase of their study and shouldn't be read at the beginning. (I was turned off to learning card SOH in the beginning many years ago back in the '70s because I first read EATCT before reading the basics) No one is an expert at the the beginning and it takes years to become one...so why tackle this advanced book in the beginning?
RRTCM is geared more to the beginner and so it is recommended by the masses. I don't condone that. But, I recommend CC to the more serious student who has already exhausted the books that deal with basics and wants to advance to the intermediate/advanced phase of their study. CC (5 volumes) is a compendium of card SOH/effects that I myself use mainly as a source of reference.
For example the Double Undercut is categorized as a Transfer Cut not a control as many have stated. When the sleight was originally introduced (Dai Vernon), it was used to transfer the top card to the bottom and vice versa. Later it was used by many as a control (which Dai detested).
The sleight can be found in CC volume 1 chapter 6 entitled "Transfer Cuts". There are better controls out there such as Marlo's Deliberate Side Steal, the Classic and Turnover pass, etc.
If you are a beginner and wish to learn card SOH as a hobby then RRTCM by Hugard/Braue is a great value for the money...if you wish to continue to become a serious student and are willing to save your money, then I recommend CC by Roberto Giobbi...it's the best bang for your bucks!