The old booklet, Jumbo Card Manipulation by Dariel Fitzkee, consists mostly of adaptations of standard card sleights (like the Pass) to Jumbo Cards. There are also some flourishes. Probably the only thing in it regarding Stage Card Manipulations is the ?Jack Miller?s Back Hand Palm?. Which, even the author admits: ?I cannot see how this sleight is practical, as the card absolutely cannot be covered.?
A booklet that I recommend is Magic By Jan Torell (published in 1975). It had a few very clever ideas with jumbos cards. And was the first time that I saw a jumbo card with black velvet glued on the back. His adaptation of the Black Art principle was terrific in that the card was hidden against his costume as opposed to relying on a black backdrop. This use of his tuxedo as a Black Art curtain made it truly practical.
Having manipulated jumbo cards in the years past, I can say from experience that the hardest part is creating a moves that are practical and can fool people in real world conditions; semi-surrounded and in full light.
The first person I saw doing a good jumbo card routine was the late Richard Ross (1970s). And later the Japanese magician Sanada (Early 1980s).
Pete Biro is correct, you should work on your own moves and Piatnik Brand Jumbo Cards (Made In Austria) are the best for manipulation. Due to there heavy weight, the Jumbo Bicycles are only useful for card scaling, card castle making and other special gimmicked cards.