From The Warming Papers published in 2010.

"The potential cooling impact of aerosols is the kernel of truth at the heart of the "scientist's claimed global cooling in the 1970's" myth that survives in popular perceptions of climate change science. It was quickly realized, however, that greenhouse gases are stronger than aerosols, so warming wins."

http://shadow.eas.gatech.edu/~kcobb/warming_papers/Mitchell_etal_1995.pdf