I was cruising around Baist's 1921 Real Estate Atlas (thank you ProphetM) and I came across this cemetery on
North Broadway next to the Southern Pacific Rail Yard.
www.historicmapworks.com
Since I didn't recall a cemetery in the area, I checked Google Maps and found this:
google maps
A few years after Baist's Atlas was prepared, it seems the Catholic church decided to turn the cemetery into
a high school. All the bodies were dug up and moved to the "new" Calvary Cemetery in East L.A.
Cathedral High School now occupies the old graveyard area, and in recognition of their past, the sports teams
are nicknamed the Phantoms.
It also looks like St. Peter's Italian Church on Broadway was the Memorial Chapel shown on the 1921 map.
Google Street View