Sources

• {#1} E-mail (MR03307) 30 JAN 2007 {private}
• {#2} Mike&John Plaza’s 1910 U.S. Census (MR02778), 23 APR 1910, Rockvale
  
  Thirteenth Census of the United States: 1910 - population
  
  State: Colorado
  County: Fremont
  Township or other division of county: Precinct 25 Rockvale
  23rd of April, 1910
  Supervisor’s District No 3
  Enumeration District No 79
  Sheet 7 (……?)
  
  line 51, dwelling 143
  
  Plaza Mike, head, male, 37 (27?) years old, married, 10 members of family, place of birth: "Austr. Polish", father’s place of birth Austria-Polish, mother’s place of birth: Austria-Polish, immigrated in 1900, alien (has NOT been naturalised), speaks English, coal miner, no school
  
  Plaza Henrietta, wife, female, 28 years old, 10 members of family, 5 younger children(?), place of birth Austria-Polish, father’s place of birth Austria-Polish, mother’s place of birth: Austria-Polish, immigrated in 1900, speaks English, is able to read and write
  
  Plaza Francis, daughter, female, 8 years old, born in Pensylvania, father born in Austria-Polish, mother born in Austria-Polish, (able to do sth specified in column 25)
  
  Plaza John, son, male, 6 years old, born in Colorado, father born in Austria-Polish, mother born in Austria-Polish
  
  Plaza Tony, son, male, 4 years old, born in Colorado, father born in Austria-Polish, mother born in Austria-Polish
  
  Plaza Peter, son, male, 2 years old, born in Colorado, father born in Austria-Polish, mother born in Austria-Polish
  
  Anni(?), daughter, female, 1 month old ("1/12"), born in Colorado, father born in Austria-Polish, mother born in Austria-Polish
  
  Kopacz Joseph, brother in law, age 27 (or 22?), born in Austria-Polish, father born in Austria-Polish, mother born in Austria-Polish, immigrated in 1907, alien, speaks Polish, coal miner, able to read and write
  
  line 59, dwelling 144
  
  Plaza John, head, m., 30y, AUST-POL, immigrated 1910 (191……?), speaks English, coal miner, able to read adn write
  
  Plaza Annie, wife, f., 28y, AUST-POL, imm. 1902, speaks Polish, can't read
  
  Plaza Mary, daughter, f., 6y, born Pensylvania
  
  Plaza Mike, son, m., 4y, born Colorado
  
  Plaza Frank, son, m., 2y, born in Colorado
  
  Kopacz John, brother in law, m., 40y, AUST-POL, imm. 1907, alien, speaks Polish, coal miner, able to read and write
• {#3} Henrietta Plaza’s 1920 U.S. Census (MR02767), 3 FEB 1920, Rockvale
  
  Colorado, Fremont County., South Canon, Precinct 21, ED 67, sheet 3 A, lines 30-35, enumerated February 3 & 4, 1920
  Wolf Park Mine
  
  (lines 1-4 is Trella Maggie, cited here: sheet 2 B)
  
  Plaza Henrietta, head, rents the house, female, 39 y., married, year of immigration: 19…… (might be 1900 or 1908), naturalised in 1912, able to read and write, born in Austria/Poland, father and mother born in Austria/Poland, able to speak English
  
  Plaza John, son, m., 17 y., single, no school, able to read and write, born in Colorado, able to speak English, colar miner (!!! age !!!)
  
  Plaza Peter, son, m., 11 y., school: yes, able to read and write, born in Colorado, able to speak English
  
  Plaza Anna, daughter, 9 y., school: yes, can't read (yet), born in Colorado
  
  Plaza Mary, daughter, 4 y. 9 m., born in Colorado
  
  Plaza Katie, daughter, 1 y. 9 m., born in Colorado
  citation: 28 AUG 2006
• {#4} Family History of Michael Plaza and Henrietta Zulkowski Plaza. Letter with attached collection of documents (MR03130), {private} (4 JAN 2007); where: D

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• Ann Plaza and her birth may be mentioned in the following sources:
• {#1} U.S. Social Security Death Index, Ancestry LLC, ssdi.rootsweb.ancestry[.]com
  citation: 6 JAN 2008

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