# Introduction

These guidelines document current cataloguing practice at Wellcome for objects catalogued in MARC in the Library management system (currently Sierra). Past practice has varied greatly, particularly between formats, these guidelines also aim to explain such legacy data, where necessary.

## What is covered in this manual?

**Metadata Content** \
Outline of MVR & Basic level record contents

**Bibliographic, Item & Holdings records**\
Standard and local use of MARC & Sierra fields

**Classifications**\
The Barnard classification scheme and use of NLM and LoC at Wellcome

**Authorities**\
LCSH & LCNAF, MESH, Homosaurus, Local headings & Genres. Authority maintenance.

*Format/collection specific?*