The new Mounts of Tamriel series has 13 books and Night Market Miscellanea adds 45. I think there is one more new one called Investigator's Notes under Military Orders and Reports.

I would like to curate a list of locations for these books prior to the release in the hopes that they are not released with missing books so can I ask if people know where the books are, they respond and we can add their location to the list. Please note, this is limited to the new categories, I am aware there are several other bugged books, these are being tracked separately on: https://forums.elderscrollsonline.com/en/discussion/comment/8414676#Comment_8414676

Military Orders and Reports
Investigator's Notes

Mounts of Tamriel
Introduction
Volume 1, Horses -
Volume 2, Wolves and Foxes - Auridon, Blackwood, Glenumbra & Galen Stablemasters
Volume 3, Nix-Oxen - Telvanni Peninsula & Vvardenfell Stablemasters
Volume 4, Big Cats - Bangkorai, Craglorn, Greenshade, Reaper's March, Rivenspire, Summerset, Western Skyrim, Gold Coast & West Weald Stablemasters
Volume 5, Kagouti and Guar - Deshaan, Murkmire, Shadowfen, & Stonefalls Stablemasters
Volume 6, Camels - Alik'r & Hews Bane Stablemasters
Volume 7, Durzogs - Solstice, Coldharbour, & Fargrave Stablemasters
Volume 8, Elk - Grahtwood, Malabal Tor, & High Isle Stablemasters
Volume 9, Senche-raht - Northern & Southern Elsweyr Stablemasters
Volume 10, Rams - The Rift, Eastmarch, & Stormhaven Stablemasters
Volume 11, Bears - The Reach & Wrothgar Stablemasters
Volume 12, Constructs - Clockwork City Stablemaster

Night Market Miscellanea
A Meeting Between Friends
A Study in Glinting and Gleaming
Abandoned Requisition Request
Accusation of Falsity
Add to the Collector's Villa
Blunt Their Weapons
Burn the False Propaganda
Checklist for Challenging the Opulent
Curator Dossier
Curious Missive
Curious Missive (1)
Curious Missive II
Curious Missive III
Curious Missive IV
Desperate for the Fantastical
Elegy of Forgotten Fatelines
Esetev's Report on the Parch
Essential Knots for Sailing
Free the Caged
Gilded B'Kyfxi's Research
I've Had It
In Memory of the Pathfinders
In Need of Mortal Implements
IT'S NOT A POTION!
Join the Glittering Goad
Join the Ruckus
Join the Thousand Eyes
Letter for Moon-Eye
List of Items to be Auctioned off in House Malenel
Marifah's Journal
Myshka's Journal
Night Market Report
Relics of the Night Market: The Egg of Arac
Report on Sorrow's Friend
Report on the Skittering Precinct
Reward for Missing Mortals
Rules of the Night Market
Scamp Eyes Hurt
Slumbering Danger: Who are the Opulent?
Something Is Eating Our Eyes
The True Nature of the Night Market
Thieves in the Starlit Plaza
Thoughts about the Windglass
Urgent! Food Needed
Work Order: Spider Deterrent Devices

Edit: Added locations of Mounts of Tamriel based on the information provided by @Soarora