This volume, Nicene and Post-Nicene Fathers, First Series, Volume 12, contains the writings of John Chrysostom (4th cent. A.D.) on 1st and 2nd Corinthians.
The other volumes in these sets (Ante-Nicene Fathers, Nicene and Post-Nicene Fathers, First Series, and Nicene and Post-Nicene Fathers, Second Series) contain the writings of other Church Fathers from the late 1st century to the 7th century. They record the actual writings of the Fathers with minimal history and commentary about the writings. As such, they are primary sources and not secondary sources. There is no overlap in the material covered.
By contrast, the set by Philip Schaff shown on the page (History of the Christian Church) is a 19th century church history and doesn't contain the actual writings of the Church Fathers. It's a secondary source, not a primary source.
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This volume contains St. John Chrysostom's Homilies on First and Second Corinthians.
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