Thanks!

Following up on your suggestions, I found the appropriate part of TFM:

https://www.gnu.org/software/emacs/manual/html_node/elisp/Standard-File-Names.html#Standard-File-Names

Tyler

On Oct 18, 2013 7:02 PM, "Josh" <josh@foxtail.org> wrote:
On Fri, Oct 18, 2013 at 3:49 PM, Rüdiger Sonderfeld
<ruediger@c-plusplus.de> wrote:
> On Friday 18 October 2013 15:37:19 Josh wrote:
>> I think you mean (expand-file-name "grass-data" user-emacs-directory)
>> or similar.
>
> I think (locate-user-emacs-file "grass-data") would be better.

Indeed it would.  The form I suggested was adapted from the first grep
result that caught my eye:
  ./net/eww.el:  (with-temp-file (expand-file-name "eww-bookmarks"
user-emacs-directory)
but I see that I stopped reading too soon :)