On October 25th, 1995 Aqua Caliente sent a request letter to the Pala Band of Mission Indians asking for the blood quantum of Margarita Brittain. Stan McGarr, Pala's Tribal Secretary at the time, responded with a letter saying Margarita was 4/4 and her children were 1/2.
Here are the letters:
1995 Oct 25 Agua Caliente Request Letter for Margarita Brittain's Blood Quantum and Her Children