diff --git a/conservancy_beancount/books.py b/conservancy_beancount/books.py
index 09a87999769c57295598e74bda353b42a515e420..42bf43498c3d6c90b6f2c5788ba0712392c9ea9c 100644
--- a/conservancy_beancount/books.py
+++ b/conservancy_beancount/books.py
@@ -254,3 +254,16 @@ class Loader:
             'lineno': lineno,
         }
         return LoadResult.empty(Error(source, "no books to load in configuration", None))
+
+    @classmethod
+    def dispatch(cls,
+                loader: Optional['Loader'],
+                from_fy: Optional[Year]=None,
+                to_fy: Optional[Year]=None,
+    ) -> LoadResult:
+        if loader is None:
+            return cls.load_none()
+        elif to_fy is None:
+            return loader.load_all(from_fy)
+        else:
+            return loader.load_fy_range(from_fy or 0, to_fy)