Technical appendices to a study in both California and the United States as a whole of the demographic characteristics and child care arrangements of children with immigrant parents who do not speak English well, the characteristics of center-based settings attended by these children, and the relationship of center-based care use to their academic skills at school entry, based on survey and observation data from a study of preschool in California and on data from a longitudinal study of the development and experiences of children born in 2001 in the United States