Conception:
I got the idea for this mod from Richwizard's New Vegas Lockpicks, which adds a set of lockpicks that boosted your skill and used similar models. I decided to expand upon this idea and created this mod to cover a larger list of player skills including Medicine, Science, and more.

Requirements: 

New Vegas Script Extender or xNVSE (Both versions of the mod require NVSE)
Fallout New Vegas DLCs Dead Money and Honest Hearts

Compatibility:
The items are added to the leveled lists via a script and should not conflict with mods that edit these too.

Installation:
Drop the files included in the zip archive inside "Data" into your New Vegas data directory. Activate with your preferred launcher.

Bugs or Issues:
Items may not always spawn on vendors or their inventories. I've added various fixes to try and combat this. However, please report any problems via the comments section or contact me directly if need be.

Alternative Version:
Sweet6Shooter has created another version of this mod that includes TTW support among other changes. I'd recommend checking out it with this link:

Skill Items Redux

Note that you will still need to download and install this mod for the models and textures!

Items:

Marketing For Nitwits
"A Pre-War book from the 'For Nitwits' series. This particular entry pertains to all things bartering in a manner anyone can understand. Well, maybe NOT everyone."
Effect - Adds +5 to Barter when in the inventory
Base Value - 1000 Caps
Weight - 1 unit

Accouting-Boy 1000 Module
"A module that slots into any compatible Pip-Boy model. It streams quick and accurate information for a variety of products to achieve optimal buying prices without breaking bank."
Effect - Adds +10 to Barter when in the inventory
Base Value - 2200 Caps
Weight - 1 unit

Meeting People Archives Holotape
"An ancient, dust-ridden holotape from before the War. It has a title affixed with yellowing tape proclaiming to contain an archive of every Meeting People issue."
Effect - Adds +5 to Speech when in the inventory
Base Value - 1200 Caps
Weight - 1 unit

Pip-Boy Vocal Modulator Parts
"The basic components for a Pip-Boy's Speech Modulator. You think you can manage to install them properly."
Effect - Adds +10 to Speech when in the inventory
Base Value - 2500 Caps
Weight - 2 units

Lockpick Set
"A basic set of locksmithing tools designed to open common pin- and tumbler-type locks."
Effect - Adds +5 to Lockpick when in the inventory
Base Value - 1200 Caps
Weight - 1 unit

Expanded Lockpick Set
"Complete set of high-quality locksmithing tools designed to open any pin- and tumbler-type
locks."
Effect - Adds +10 to Lockpick when in the inventory
Base Value - 2400 Caps
Weight - 2 units

Paramedic Bag
"A small bag often carried by paramedics for storing basic medical supplies." 
Effect - Adds +5 to Medicine when in the inventory
Base Value - 1300 Caps
Weight - 5 units

Field Surgeon Kit
"A large rucksack containing essential equipment for combat medics to treat a variety of traumatic injuries sustained in the field."
Effect - Adds +10 to Medicine when in the inventory
Base Value - 2600 Caps
Weight - 6 units

Beginner's Book of Science
"A small book covering basic scientific principles spanning many fields. It appears some volumes are missing, however."
Effect - Adds +5 to Science when in the inventory
Base Value - 1000 Caps
Weight - 1 units

Beginner's Books of Science Complete Edition
"The complete collection of science books printed by Harvard University spanning several fields. These are significantly more detailed than the single volume."
Effect - Adds +10 to Science when in the inventory
Base Value - 2000 Caps
Weight - 5 units

Scout's First Compass
"A basic compass created for up-and-coming campers. It appears to still be functional."
Effect - Adds +5 to Survival when in the inventory
Base Value - 250 Caps
Weight - 1 unit

USAF Pilot Survival Kit
"A kit developed by the USAF to be carried by pilots in the event of being shot down in enemy territory. Contains valuable survival supplies."
Effect - Adds +10 to Survival when in the inventory
Base Value - 2500 Caps
Weight - 5 units

H&H Tool Kit
"A small, lightweight kit built to accept H&H brand tools. It seems to still contain a few."
Effect - Adds +5 to Repair when in the inventory
Base Value - 750 Caps
Weight - 2 units

Snap-Off Super Tool Kit
"A heavy tool box produced by Snap-Off containing more tools than you could ever imagine. It's in excellent condition." 
Effect - Adds +10 to Repair when in the inventory
Base Value - 2150 Caps
Weight - 10 units

The items should now be available across a wide group of vendors. They can be found anywhere crafting supplies are sold, on certain medical vendors, and even those who specialize in junk trading. Similarly, they may now also spawn in containers alongside other similar loot and/or found being carried by NPCS!
The item bonuses will not stack with one another and the higher tier bonuses will overwrite the lower tier bonuses automatically.

Two models used in this mod were taken from Jokerine's Misc Resources and Tutorials - FNV

Credits:
Black Isle and Interplay (For Fallout 1/2 and original items)
Bethesda and Obsidian (For base models, textures, the GECK, and 3/NV/NV DLC)
Nukapedia + The Vault (For in-game information)
NVSE Team (Authors of New Vegas Script Extender)
Jokerine (Author of Jokerine's Misc Resources and Tutorials - FNV)
Richwizard (Author of New Vegas Lockpicks, the mod that inspired me to create this one)
Ghille Attano/Shirtless Pants (Mod author)

Extras:
If I'm infringing upon anyone's work please let me know and I will take down my mod as quickly as possible so that I am not wrongfully copying anyone's own work. If this mod is found too similar to Richwizard's mod I will promptly remove this mod from the Nexus.