Which word means both an early schoolbook and a preparatory coat of paint?

Which union, with roots in a 1962 group founded by César Chávez and Dolores Huerta, led a famous grape pickers' strike? An early debate over forensic ballistics was central to the 1921 murder trial of which two Italian-American anarchists? What massage-related name did Google's founders give their early search engine at Stanford? An early recorded use of the phrase "busy as a bee" appears in which work by Geoffrey Chaucer? An early version of "The Potato Eaters" was among three paintings by which artist stolen from a Dutch museum in 1988? What was the name of the early version of the trombone used in Renaissance music? An early version of which D.H. Lawrence novel was published in 1972 as "John Thomas and Lady Jane"? Ethan and Joel Coen co-wrote the 1985 film "Crimewave" with which future director of "Spider-Man"?