For a cloud chart:
http://www.ccrc.sr.unh.edu/~stm/AS/Weather_Toolbox/Cloud_Classification.html
Be sure to look at the SOURCE list at the bottom of the screen.

The NOAA/NASA cloud chart is online at http://www.weather.gov/os/brochures/cloudchart.pdf

NOAA Central Library in Silver Spring, MD has copies of  a National Weather Service cloud chart.  Contact them at reference@www.lib.noaa.gov