Current population reports: Series P-20, Population characteristics. * Paper, $14.00 (including Series P-20, P-23, P-25, P-26, P-27, P-28 summaries, P-60, and P-65 for one year), $3.50 additional for foreign mailing; single copy prices vary. 238. Selected characteristics of persons and families of Mexican, Puerto Rican land other Spanish origin, Mar. 1972, (advance data from Mar. 1972 sample survey).