Greum, you supplied enough of the lyrics in your OP for me to locate the lyrics. For future reference, what I did was highlight the

And if the Irish population
Had a dose of ?
There'd be less immigration
Matter a damn.

you supplied and then did a Google search. They were in the site that appeared first. I don't know who Burrowes-Coffey are, but I'd suspect maybe/possibly the songwriters.