Coolidge discovered 9 NGC-objects, using the 15" f/18 Merz refractor of harvard College Observatory, installed in June 1847. Alas, no non-stellar object is among them! The observations were published by the director of Harvard College Observatory George Phillips Bond (among others by Bond, Safford and Tuttle): Bond, G. P., List of New Nebulae seen at the Observatory of Harvard College, N [1453] 61, 193-198 (1864).

D	N	NI	Y	M	D	Ap	I	T	Con	Type	S	List
1	N	1251	1860	1	25	15,0	Rr	v	CET	*2	9	4
1	N	1312	1859	12	16	15,0	Rr	v	TAU	*2	9	5
1	N	3123	1859	3	31	15,0	Rr	v	SEX	*	9	13
1	N	3229	1859	3	31	15,0	Rr	v	SEX	*3	9	14
1	N	4582	1859	5	3	15,0	Rr	v	VIR	*	9	15
1	N	5200	1859	4	30	15,0	Rr	v	VIR	*2	9	16
1	N	5310	1859	4	30	15,0	Rr	v	VIR	*	9	17
1	N	5404	1859	4	29	15,0	Rr	v	VIR	*3	9	19
1	N	7403	1859	11	15	15,0	Rr	v	PSC	*	9	32

Harvard Observatory with 15" Merz-Refractor