Obviously - the cache is NOT at the shown coordinates, but is within 1 km.
In the deep dark past when dinosaurs roamed the earth, before Google, Wikipedia or AI and even before Encyclopedia Brittanica or Funk and Wagnall's there were libraries. We went to libraries to find information to write essays, papers, do homework or to just find out about subjects of interest. Some of us who lived out in the sticks had large trucks full of books that stopped near where we lived twice a month. They would bring the books you had requested 2 weeks earlier. The lag time was terrible! That was how we got the information we needed to do our homework.
The way the information was accessed from the books in the library or the truck, was by using a filing system called the Dewey Decimal System.
Noting the irony - WIkipedia says that the system was developed in 1876 by Melvil Dewey. The system catalogs books using a decimal number classification that places books in the library relative to the location of other books in the collection. This makes it possible for a person to locate a particular book and for someone else to return the book to its rightful place in the library.
There have been 23 revised editions of the classification system, the last in 2011. This system is reviewed by a ten member international board that meet twice a year. The English version of the Dewey Decimal System is no longer printed but is now available from WebDewey. This is a subscription service and I did not use it in the planning of thiss cache.
The General Classes of the system are:
000 Generalities
100 Philosophy & psychology
200 Religion
300 Social sciences
400 Language
500 Natural sciences & mathematics
600 Technology (Applied sciences)
700 The arts
800 Literature & rhetoric
900 Geography & history
The decimal numbers following the General Class number define the subject of the book and the last set of numbers indicate the author or title of the book.
For instance: LanMonkey's book Geocaching Guidebook to Metro Vancouver & the Fraser Valley has a DDS number of 917.113 KEN . The book is filed in the Geography and History portion of the system with the 113 identifying the subject and KEN are the first 3 letters of J, Kennedy's last name.
To find the final location you will need to find the DDS numbers of the following subjects loosely tied to geocaching. You need to find the missing number.
A Geocaching 7A6.587
B Digital Photography 7B0.4
C Dinosaurs - like the CO 5C7.9
D Orienteering 7D6.582
E Handheld GPS systems 3E7.7
F Computer Languages 0F5.13
G Seattle - home of Groundspeak 9G9.7
H Outdoor Safety 6H3.6
The FInal is at N 49 0A.CEG W122 3B.DFH