Grabau (2000), p. 145. Grabau, Warren (2000). Ninety-Eight Days: A Geographer's View of the Vicksburg Campaign. Knoxville, Tennessee: University of Tennessee Press. ISBN9781572330689. OCLC1359089503.
Grabau (2000), pp. 144–145. Grabau, Warren (2000). Ninety-Eight Days: A Geographer's View of the Vicksburg Campaign. Knoxville, Tennessee: University of Tennessee Press. ISBN9781572330689. OCLC1359089503.
Grabau (2000), p. 146. Grabau, Warren (2000). Ninety-Eight Days: A Geographer's View of the Vicksburg Campaign. Knoxville, Tennessee: University of Tennessee Press. ISBN9781572330689. OCLC1359089503.
Grabau (2000), p. 149. Grabau, Warren (2000). Ninety-Eight Days: A Geographer's View of the Vicksburg Campaign. Knoxville, Tennessee: University of Tennessee Press. ISBN9781572330689. OCLC1359089503.
Grabau (2000), pp. 148–149. Grabau, Warren (2000). Ninety-Eight Days: A Geographer's View of the Vicksburg Campaign. Knoxville, Tennessee: University of Tennessee Press. ISBN9781572330689. OCLC1359089503.