In the Second Paragraph:
"field effect transistor (FET) is a unipolar device, conducting a current using only one kind of charge carrier. If based on an N-type slab of semiconductor, the carriers are electrons. Conversely, a P-type based device uses only holes."

Changed the middle sentence, Now the Paragraph reads:
"field effect transistor (FET) is a unipolar device, conducting a current using only one kind of charge carrier. It is based on a N-type slab of semiconductor, where the carriers are electrons. Conversely, a P-type based device uses only holes."

 

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Thanks for taking the time to provide feedback on the material and apologies for the lateness of my reply.

See: http://www.allaboutcircuits.com/vol_3/chpt_2/9.html

I am inclined to believe the material reads better with the original statement, therefore do not recommend any chances to the e-book material.

Dave