A collection of historical accounts is a group or set of written or recorded accounts that describe or document events or periods in the past. These accounts can include primary sources such as diaries, letters, and photographs, as well as secondary sources such as histories and biographies written by historians and other scholars.

A historical timeline is a graphical representation of the events and periods of history, typically arranged in chronological order. The procedure for creating a historical timeline involves the following steps:

1. Research: This involves gathering information about the events and periods that you want to include on your timeline. This can be done through a variety of sources such as books, articles, documents, and online resources.

2. Organize: Once you have collected your information, you will need to organize it in chronological order. This can be done by dividing your timeline into specific time periods or by using specific dates as reference points.

3. Create: After you have organized your information, you can create your timeline by using a graphical tool such as a spreadsheet or timeline software. This will allow you to visually represent the events and periods of history in a clear and concise manner.

4. Annotate: Finally, you can add additional information and context to your timeline by including annotations or notes about the events and periods that you have included. This can help to provide a deeper understanding of the historical context and significance of each event.