Basic measures, such as weight, length, volume, or area were used by people in any part of the globe since the down of the civilization. Not only there were no universal system for all, even within the same country measures often were different from place to place. The same measures could also significantly change in time as standards were not yet invented.

Source: Random Acts of Kindness – Family Tree Encyclopedia
This describes the various old-time Illnesses and Diseases that you will find in old documents, medical records or listed as causes of death on old death certificates or in old family Bibles.

Source: Random Acts of Kindness – Family Tree Encyclopedia
The following list describes the various old occupations of which many are archaic. These are useful to genealogists since surnames usually originated from someone’s occupation.

Families Unearthed is a private website dedicated to family history with an excellent compilation of identified naming conventions by nationality/culture, some name abbreviations that are used in genealogy and the more common nicknames that are used.

Source: Random Acts of Kindness – Family Tree Encyclopedia
This list describes a host of genealogical terms that you may find in your genealogical investigations and documents, some of which may no longer be found in a typical dictionary and are now obsolete.

This excellent link provides you the opportunity to see what day of the week were for any point in history or the future and for any country.

Link allows one to calculate the approximate value of your currency today versus some time after 1800.

Source: Random Acts of Kindness – Family Tree Encyclopedia
Herein to be found in this link is a list of some 18th and 19th-century common American nicknames and their given name equivalents.

Source: Random Acts of Kindness – Family Tree Encyclopedia
The following abbreviations are those most commonly used in genealogical records. It is not unusual to find, within the pages of one record, different variations used, but care should be taken to ensure that in these instances, it is a variation and not meant to indicate something else.

Source: FamilySearch & The Church of Jesus Christ of Latter-day Saints.
Written by Tyler S. Stahle.
This the third of a three-part series exploring how to use the Genealogical Proof Standard in your family history research. Read Part 1: Understanding the Genealogical Proof Standard; and Part 2: Understand How to Successfully Apply the Genealogical Proof
Standard.

Source: Random Acts of Kindness – Family Tree Encyclopedia 
This link will provide you with a list of some of the most commonly seen symbols on gravestones and memorials, along with their common interpretations. Learn the meanings of the various carvings, symbols, icons and other funerary art found on gravestones, tombstones and headstones.

Source: FamilySearch & The Church of Jesus Christ of Latter-day Saints.
Written by Tyler S. Stahle.
This the second of a three-part series exploring how to use the Genealogical Proof Standard in your family history research. Read Part 1: Understanding the Genealogical Proof Standard; and Part 3: Three Ways to Ensure Your Research Meets the Genealogical Proof Standard.

Source: FamilySearch & The Church of Jesus Christ of Latter-day Saints.
Written by Tyler S. Stahle.
This is the first of a three part series. Life is good for the family historian with dozens of records containing direct evidence. Accurate and complete marriage certificates that list the marriage date, full legal names, and the names of each set of parents can be more valuable than a shoe box full of money in the search for a missing ancestor. Please read Part 2: Understand How to Successfully Apply the Genealogical Proof Standard; and Part 3: Three Ways to Ensure Your Research Meets the Genealogical Proof Standard.

The USGenWeb® Project was established in 1996 by a group of genealogists who shared a desire to create free online resources for genealogical research. Originally beginning with online directories of text-based resources, their vision has grown into a network of over 3000 linked websites, all individually created and maintained by a community of volunteers. Today you may find a variety of unique county and state resources including photos, maps, transcriptions, historical documents, helpful links, and much more.

Source: Random Acts of Kindness – Family Tree Encyclopedia 
The link will give a general list of major American and worldwide epidemics to refer to.