I just joined in the hope I could add to my list of trade magazines and newsletters covering euope, north america, middle east and asia pacfic.This book listings seems mostly focused on fiction related items. Not useful for me who writes about energy in all its formats including oil,gas, shale oil, shale gas, electricity including nuclear, renewables, coal power etc. Can any one help in my diversification plans.
The Writer's & Artists Yearbook has a section on magazines including trade. The web would also be your avenue for researching specialist titles.
Good luck