A historic site is where pieces of political, military, cultural, artistic, or social history have been preserved due to their cultural heritage value
An heirloom plant is an open-pollinated cultivar that was commonly grown during earlier periods in human history, but which is not used in modern large-scale agriculture
A heritage sheep breed is a British breed pre-1960

GENERAL
Historical features
GENERAL
Planning, treatment and management of historic landscapes | National Park Service
Managing land in an SSSI | UK Government
Current guidance and advice | Historic England
Genetic diversity
GENERAL
What is heirloom and heritage breeds | Kitchn
Heritage breeds background | The Livestock Conservancy
Heirloom plants definition and background | EcoWatch
Resilience in heritage and heirloom species | Ecozine
Conservation grazing network | RBST
What to consider when moving into rare breeds | RBST
Traditional livestock management
GENERAL
Transhumance knowledge sharing | iSAGE
The Rod and Staff method in sheep farming | Gone Outdoors