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	1.	No cover image available Introduction to carrier current communications ed. by J.W. Petrie, H.E. Clapham. by Petrie, H.E., ed Clapham, H.E., ed Material type: Text Publication details: Illinois Automatic Elec.Co. 1949 Availability: Items available for reference: JRD Tata Memorial Library: Not for loan (1)Call number: 621.37 N572.
	2.	No cover image available Priniciples of automatic telephony circuits and trunking by H.P. Mahoney. by Mahoney, H.P Material type: Text Publication details: Chicago Automatic Elec. Co. 1925 Availability: Items available for reference: JRD Tata Memorial Library: Not for loan (1)Call number: 621.3857 N25.

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