The essay "In Commemoration: One Million Volumes" is included in the book The Magic of Words: Rudolfo A. Anaya and His Writings, edited by Paul Vassallo. This book was published by The University of New Mexico Press in 1982. The essay "A Celebration of Grandfathers" has been printed in several anthologies, including Prentice-Hall Literature for 9th grade and Prentice Hall's Timeless Voices, Timeless Themes 11th grade level. I couldn't find any primary sources for either of these essays on the Internet, but do some more searching to see if you can find more.
I hope this helps you.