Question

In the days of the old German empire no less than thirty-five different tolls were levied between Melnik and Hamburg, to say nothing of the special dues and privileged exactions of various riparian owners and political authorities.

Q: Answer-In the days of the old German empire no less than thirty-five different tolls were levied between Me...

For uncountable plural nouns, less is used. With countable plural nouns, the quantifier few should be used. So here, fewer is correct. In the days of the old German empire no fewer than thirty-five different tolls were levied between Melnik and Hamburg, to say nothing of the special dues and privileged exactions of various riparian owners and political authorities.