Lichtenstein lithos are tops in 20th century art at Ahlers & Ogletree, Aug. 8ATLANTA – Two signed lithographs by famed American Pop Art icon Roy Lichtenstein (1923-1997), three works by the noted Mexican artist Leonardo Nierman (b. 1932), and a signed lithograph by renowned Colombian artist Fernando Botero (b. 1932), are just a few of the many items that will be sold at an Ahlers & Ogletree auction […]