Paying attention to details can be very helpful when you are geocaching. Some cachers carry a notebook with them and write details down about every cache they find. Other cachers take pictures of each cache they find.
When finding the caches in this series you will need to keep track of the details. Keeping track of the details of these hides will be the only way you will find the Bonus Cache that is associated with this series of caches.
You will need to find each of the 19 caches in this series, keep track of the details of each cache and then you will be able to find the bonus cache using the details you have collected.
Good luck and I hope you keep good notes.
https://coord.info/GC9MGC0
Link To Bonus Cache