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Page 150 states, "HT/OFDM uses 64 sub carriers versus the 52 used in OFDM".

This is wrong. 

HT/OFDM uses 52 data sub carriers out of 64 total

OFDM uses 58 data sub carriers out of 64 total

I can't seem to find any Errata, anyone from CWNP confirm if there is any errata?

to correct your answer (for 20MHz BW):

- Non-HT (OFDM) has 64 sub-carriers, 48 used for data (4 pilots, 12 unused "guard")

- HT/VHT (HT-OFDM) has 64 sub-carriers, 52 used for data (4 pilots, 8 unused "guard")

Thanks

You are correct, 58 was a typo, thanks for correcting that.

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