The phrase 'inquiries of' is correct and usable in written English.
It is used to refer to asking someone a question. For example: He made inquiries of the store to see if they had the product in stock.
But this is not unusual for inquiries of this sort".
Inquiries of the local police turned up nothing.
Those rebates are the subject of federal and state antitrust inquiries of Intel.
The story did not stand up to the inquiries of at least five experienced journalists.
Driben makes three inquiries of each new athlete he meets: name, major and plans.
Both had previously declined to take action in their inquiries of the senator.
One of the most hotly anticipated parliamentary inquiries of 2012 is the one into library closures.
He made inquiries of CBS and was told that this was Sir Thomas himself.
All this prompted me to make a few inquiries of my own.
Similar inquiries of past crashes have yielded safety recommendations that ended up ignored or rejected.
"Some say specifically they don't want it to look like inquiries of the past".
