I'm not quite sure which preposition should be used after these two words: qualification and contracting/contractor If you could have a look at these sentences:
Qualification for General Contracting
Premium Class Qualification of General Contracting for Highway Engineering
Thanks
Top answer
Qualification for General Contracting Premium Class Qualification for General Contracting for Highway Engineering
— Mister Micawber
Qualification for General Contracting Premium Class Qualification for General Contracting for Highway Engineering
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