I am always up for a challenge helping people find things on the internet. I found this site that has 2 full issues on .pdf format, maybe if you contact them, they have other issues. I don't think these 2 are one of the ones you are looking for, the quality is good.Sorry you'll have to cut and paste the link.
http://www.teachushistory.org/second-great-awakening-age-reform/resources/slaves-friend