[R] gpc.poly datatype

[Derek Lacoursiere]

I have a list of polygons generated by the contourLines() command (each
object of the list is a list in itself with two objects: a vector of x
values, and a vector of y values for each vertex).  I wish to convert that
list into a gpc.poly object of multiple contours.  How do I do this?  gpclib
apparently has no method of coercing lists into the gpc.poly object type.  
As well, when I have a gpc.poly object, I can view the points using the
get.pts() command, but cannot find a way of only extracting the x values of
a polygon (or the y values, for that matter).  How do I do this?
Any help would be greatly appreciated
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