The index gives an alphabetical list of golf courses which then have images presented in the rest of the brochure. The courses are:
In each image, hole numbers have been removed and a set of up to 5 numbers have been added in their place. The first step is to identify the correct hole numbers. Extract the letter for the correct hole number from the name of the course.
Royal Portrush (Dunluce) : 13,2,6 : HOP
Cypress Point : 5,4,9,6,7 : EROSS
Royal St. George's : 9,1,11,13 : ERRE
Pine Valley : 9,5,4 : EVE
Fishers Island : 3,1,10,11 : SFLA
Merion : 1,2 : ME
Mile Square : 6,7,4,10 : QUEE
St. Andrews (The Old Course) : 4,1,2,3,6 : NSTAR
Barnbougle Lost Farm : 6,15,2,13 : OFAS
Kingston Heath : 2,11,9,7 : IAHO
Shinnecock Hills : 8,10,6 : OKE
Royal Porthcawl : 8,13,10 : RWH
Winged Foot : 2,10,3,5 : ITNE
Royal Dornach (Struie) : 3,11,4,8 : YCAR
Royal Melbourne : 6,7,13,8,11 : MENLU
Pebble Beach : 10 : C
Augusta National : 11,1,8,7,5 : IANAS
Cape Kidnappers : 14,9,5 : SAK
Parsing all of the letters in order gives a set of famous gemstones. Extract a letter based on the month for which the type of gem is the birthstone.
This gives the answer ERNIE ELS.