+ Black, John p/ona Id/
Se: Mighell, Ronald L/ester/, & Black, John
P/onald/J Interregional competition in agri-
culture... 8:o 1951.
^Studies, Harvard economic. Vol. 89.
—	—	—	—
^ ^ Æ^ '^Jy t <^ti^	//¿W^t/

{
  "author": "Black, John Donald",
  "location": "",
  "title": "Interregional competition in agriculture...",
  "year": "1951"
}

+Black, John D/ o na Id/
Se: Mighell, Ronald L/ester/, & Black, John
D/onald/, Interregional competition in agri-
culture... 8:0 1951.
-Studies, Harvard economic. Vol. 89 •
ai
(bambudye Mans., Hoaa^mL
"utneaàly)

{
  "author": "Black, John D",
  "title": "Se: Mighell, Ronald L/ester/, & Black, John Donald, /Interregional competition in agriculture...",
  "year": "1951"
}