Most tile bonuses were +3 or +2, with +1 to adjacent, but that is not always the case, as there ere are 2 exceptions.
Research: wasn't one of these +3?
Rare Earth: +2 research, +1 Manufacturing
Mineral Rich: +2 research, +1 Wealth
Population: why is one of these a +1 and not a +2?
Wild Grain: +3 population, +1 Approval
Floodplain: +1 Population, +1 Wealth
