ATDTDA (14) references p 377

[mikebailey at speakeasy.net]

pulque - not a liquor, like tequila, but more
a mildly intoxicating food, like beer

Frank dreaming of Deuce taunting him and warning him off
(don't go in that) callejon - alley
(Don't go up that) subida - ascent, stairway

Semana Santa - Holy Week "nobody worked that week" 
(although the rurales were on duty - but, of course,
the military is not a job, it's an adventure...)

"the stamping mills were silent, even Silver itself
taking its day of rest, as if to recognize the
price Judas Iscariot received.  Sunlight in the trees."
(nice coda)

rurales - (Wikipedia) ...research during the 1970s 
involving detailed examination of the records of the corps 
indicated that the Rurales were neither as effective 
nor as brutal as regime publicists had suggested. 
Never numbering more than about 4,000 men located 
in small detachments, the Rurales were too thinly 
spread to ever completely eliminate unrest 
in the Mexican countryside. 

Mauser - maybe this one? 
http://www.mauserwaffen.de/1898.191.0.html?&L=1