Another request for information:
I have been trying to connect the alcohol beverage controls introduced in
the USA after Prohibition with those already in place in Canada and Sweden,
which not only had state-controlled package stores but also issued ration
books to people who wanted to buy alcohol in them. The only American state
I have come across as having introduced ration books after Prohibition was
Iowa, where, according to a report in the New York Times, 1st December
1986, until some time in the 1950s people who wanted to buy liquor had to
show "liquor cards" to the clerks in package stores; these cards were
punched with each purchase so that the state could keep track of the amount
of alcohol that an individual had bought. In time (the New York Times
article adds) it became something of a pre-marital custom in the state for
parents to demand to 
see the cards of their children's suitors. Does anyone know anything more
than this about the use of liquor cards in Iowa? or know who might know
about it? Was Iowa the only state to introduce this kind of rationing? Or
is this virgin territory for historians?