Specify PDF layout, use a PDF `compile-command' local variable.

etc/refcards/calccard.tex

@@ -6,10 +6,17 @@
 % card version 1.9, by Stephen Gildea.
 
 % This file can be printed with 1, 2, or 3 columns per page (see below).
-% Specify how many you want here.  Nothing else needs to be changed.
+% Specify how many you want here.
 
 \columnsperpage=3
 
+% PDF output layout.  0 for A4, 1 for letter (US), a `l' is added for
+% a landscape layout.
+
+\input pdflayout.sty
+\pdflayout=(1l)
+
+% Nothing else needs to be changed.
 % Typical command to format:  tex calccard.tex
 % Typical command to print (3 cols):  dvips -t landscape calccard.dvi
 
@@ -666,7 +673,7 @@ \section{Programming}
 \bye
 
 % Local variables:
-% compile-command: "tex calccard"
+% compile-command: "pdftex calccard"
 % End:
 
 % arch-tag: a2764f34-ec23-4083-bd5c-53f9e70a5da9