Compound Perfect Square Square (CPSS) Discovery Attributions.
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The number of discoveries attributed to each person or to collaborators.

Initial		Order_24	Order_25	Order_26	Order_27	Order_28	Order_29	Order_30	Order_31	Order_32	Order_33 	Order_34 	Order_35 	Order_36 	Order_37 	Order_38 	Order_39
A&J			0			0			0			0			0			116			0			0			0			0			0			0			0			0			0			0
A&M 		0			0			0			0			0			0			373			1667		5160		641 		415 		97 			37 			2 			0 			0
A&P			0			0			0			4			37			0			0			0			0			0			0			0			0			0			0			0
SEA 		0			0			0			0			0			123			0			0			1			1 			0 			0 			225 		0 			1207 		0
CJB 		0			0			4			4			11			8			4			4			2			9 			18 			0 			2 			2 			4 			1
RLB 		0			0			0			0			0			0			0			0			0			0 			0 			0 			0 			0 			0 			1
PJF 		0			2			4			10			19			38			26			35			15			44 			11 			13 			0 			4 			2 			11
TTF 		0			0			0			0			0			0			0			0			0			0 			0 			0 			0 			0 			0 			1
S_J 		0			0			0			0			0			0			12			11			15			12 			16 			7 			3 			0 			0 			0
E_L			0			0			1			1			0			0			0			0			0			0			0			0			0			0			0			0
C_M 		0			0			0			0			0			0			0			0			1			1 			1 			1 			1 			1 			1 			1
DFL			0			0			2			7			23			0			0			0			0			0			0			0			0			0			0			0
GHM 		0			0			0			0			1			12			3			54			109			296 		141 		0 			2 			3 			0 			1
L_M 		0			0			0			0			0			0			0			0			0			0 			0 			0 			0 			1 			1 			0
JDS			0			0			3			16			47			114			193			1			0			0			0			0			0			0			0			0
AHS			0			0			0			0			1			0			0			0			0			0			0			0			0			0			0			0
WTT			0			0			1			0			2			0			0			0			0			0			0			0			0			0			0			0
JBW			0			0			0			0			0			0			330			1012		2633		21402		61670 		172212		466238		1239728		3256061		8430730
THW 		1			0			1			4			2			0			0			0			0			7 			1 			0 			0 			1 			0 			0
UNK			0			0			0			0			0			0			0			3			2			0			0			0			0			0			0			0

Complete CPSS class total
		 	1			2			16			46			143			412			941			2788		7941		22413 		62273 		172330 		466508 		1239742 	3257378 	8430928
Complete CPSS isomer total
			4			16			100			220			948			2308		5688		17351		52196		150669 		429458 		1206181 	3337989 	8961794 	23989218 	62894424

Credit for Discovery

The people listed below have published or have been credited with the discovery of compound squared squares.

        AHS - Arthur H. Stone (United States, 1916-2000);
        A&J - Stuart E. Anderson (Australia) & Stephen Johnson (United States);
        A&M - Stuart E. Anderson (Australia) & Lorenz Milla (Germany);
        A&P - Stuart E. Anderson (Australia) & Ed Pegg Jr (United States);
        C_M - Carsten Müller (Germany);
        CJB - Christoffel J. (Chris) Bouwkamp (Netherlands, 1916-2003);
        DFL - Duijvestijn, Federico and Leeuw;
        E_L - Enriquee Lainez (Spain);
        F&S - P.J. Federico & R.P. Sprague (PJF constructed 23 CPSSs of order 54 based on RPS's order 55 CPSS);
        GHM - Geoffrey H. Morley (England);
        I_G - Ian Gambini (France);
        JBW - Jim B. Williams (United States);
        JDS - Jasper D. Skinner II (United States);
        L_M - Lorenz Milla (Germany);
        M&A - Lorenz Milla (Germany) & Stuart E. Anderson (Australia);
        PJF - Pasquale J. Federico (United States, 1902-1982);
        RLB - R. Leonard Brooks (England, 1916-1993);
        RPS - Roland P. Sprague (Germany, 1894-1967); (the first Perfect Square published, a CPSS of order 55, side 4205 in 1939)
        SEA - Stuart E. Anderson (Australia);
        S_J - Stephen Johnson (United States);
        THW - T.H. (Theo) Willcocks (England 1912-2004);
        TTF - The Trinity Four (R.L. Brooks, C.A.B. Smith, A.H. Stone, W.T. Tutte);
        WTT - William T. (Bill) Tutte (Canada, 1917-2002).
        UNK - Unknown.