[O] setting left margin in PDF output of ORG file

[J. David Boyd]

I can export an org file to a PDF no problem, looks great.

However, how do I get rid of the huge left and right and top and bottom
margins?  I like my PDFs to have no more than .75" top, bottom, left and
right.

I've looked through all the latex, org-latex, org-beamer variables I can find
with customize-apropos, but not having any luck.

Thanks,

Dave