Answer:
The answer is<em> other people have created.</em>
Explanation:
Basically what we need to eliminate from this passage is a phrase that does not give us any specific and precise information.
<em>contemporary historian</em> - gives us information about his profession and specifies the part of the history he`s the most competent for.
<em>historical expertise</em> - gives us information about the kind of work he has published
<em>other people have created</em> - this phrase does not give us any information about who these people are, what is their profession or what is their expert level; it is mostly imprecise and unspecific
<em>monotonous historical essays</em> - again we have the information about the type of the paper published and its theme
