In 1979 lack of rain reduced India's rice production to about 41 million tons, nearly 25 percent less than those of the 1978 harvest.
less than those of the 1978 harvest
less than the 1978 harvest
less than 1978
fewer than 1978
fewer than that of India's 1978 harvest
We only want to use "that of" or "those of" if we are comparing something *belonging* to something else:
The design of the new tablet is similar to that of its predecessor. (The design of one is similar to the design of the other.)
Jack wanted clothes similar to those of his friends. (He wants his clothes to be similar to his friends' clothes.)
In the above examples, it would be a big problem to get rid of the relative pronoun:
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