One of the early Bay Area Abstract Expressionists Frank Lobdell moved between painting and printmaking throughout his whole career. As part of the Sausalito 6 his lithographs were included in the 1948 "Drawings" portfolio, the first Abstract Expressionist portfolio done in the U.S.
For a good description of Lobdell's methods read David Acton's "The Stamp of Impulse: Abstract Expressionist Prints", Worcester Museum, 1981, page 66.
In June and July of 1966 Frank Lobdell did a series of 32 lithographs, both color and black and white, at Tamarind Lithography Workshop in Los Angeles. Working at his usual intense pace he would experiment with the stones, often reworking the images and combining different stones to create a new image.