From the collection of Hans Perk; originally posted on his blog A. Film L.A. and reproduced here with his permission.

PROD. NO. UM-38    PROD TITLE "Mickey's Polo Team"    DRAFT NO. FINAL     PAGE NO. 7    DATE 1935
SEQ.NO __________    SEQ.TITLE _______________________________________________________________
Director _________________    ASST. DIR. ____________    LAYOUT MAN ____________    SEC'Y___________
SCENE NO.	ARTIST	SCREEN FOOTAGE	B. G. DATA	DESRCRIPTION OF ACTION
52	"			Horse charging toward Holt.
53	"			Semi LS of Holt - Holt and horse raise hands - group in - big crash - smoke, etc. X-Dis. to:
54	"			Horses riding riders - all charging balls - Whoopee, etc. Duck in. IRIS GAG