In the 1970s, Mario was inspired by the popular medium of silkscreening.  For him, posters were another way of reaching the People to communicate social messages.  His posters continue to be popular, and in 2016 the Library of Congress contacted Mario to acquire the original sketches for two official Chicano Park Anniversary posters – “Veinte Años” and “Laura.”  The Library is in the process of purchasing an additional seventeen original works on paper for their permanent collection.

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