diff --git a/BUGs b/BUGs
index e546aa0..2ac38a2 100644
--- a/BUGs
+++ b/BUGs
@@ -1,6 +1,6 @@
-#### BUGS (next-41)
+#### BUGS (next-42)
 
 BUG-7:		if you remove a series from a book, it won't appear in the series drop-down if it is the first 'missing' book in that series -- either reset the list, or show all series always?
 
-BUG-30:     failed to add a book with 2 x same author (need to catch error
-                or maybe mess with author list to remove duplicate potentials?)
+BUG-41:     failed to add a book with 2 x same series - implement same fix as
+            for duplicate authors (search for processed_bals)
diff --git a/main.py b/main.py
index 2a0a665..5266f25 100644
--- a/main.py
+++ b/main.py
@@ -577,13 +577,19 @@ def new_book():
 
     bals=[]
     auth_cnt=1
+    processed_bal=[]
+    message=""
 
     if request.method == 'POST':
         # handle author info for new book
         for el in request.form:
             if 'author-' in el:
-                bals.append( Book_Author_Link( author_id=request.form[el], author_num=auth_cnt ) )
-                auth_cnt+=1
+                if not request.form[el] in processed_bal:
+                    bals.append( Book_Author_Link( author_id=request.form[el], author_num=auth_cnt ) )
+                    processed_bal.append( request.form[el] )
+                    auth_cnt+=1
+                else:
+                    message="Removed duplicate author!!!"
 
         # handle genre info for new book
         for genre in genre_list:
@@ -637,7 +643,12 @@ def new_book():
                         newbsl=Book_Series_Link( book_id=book.id, series_id=s.series_id, book_num=max_bn+1 )
                         db.session.add(newbsl)
                 db.session.commit()
-            st.SetMessage( "Created new Book ({})".format(book.title) )
+            if message == None:
+                st.SetMessage( "Created new Book ({})".format(book.title) )
+            else:
+                st.SetAlert("warning")
+                st.SetMessage( f"Created new Book ({book.title})<br>BUT {message}" )
+                
             cnt=1
             for field in request.form:
                 if 'bsl-book_id-' in field and field != 'bsl-book_id-NUM':
@@ -723,6 +734,10 @@ def book(id):
     book_form.rating.choices=[(c.id, c.name) for c in Rating.query.order_by('id')]
     page_title='Edit Book'
     CheckSeriesChange=None
+    processed_bal=[]
+    alert="success"
+    message=""
+
     if request.method == 'POST':
         if 'delete' in request.form:
             redirect_to=DeleteBook(id)
@@ -757,8 +772,13 @@ def book(id):
             cnt=1
             for el in request.form:
                 if 'author-' in el:
-                    book.bals.append( Book_Author_Link( author_id=request.form[el], book_id=id, author_num=cnt ) )
-                    cnt += 1
+                    if not request.form[el] in processed_bal:
+                        book.bals.append( Book_Author_Link( author_id=request.form[el], book_id=id, author_num=cnt ) )
+                        processed_bal.append( request.form[el] )
+                        cnt += 1
+                    else:
+                        alert="warning"
+                        message="removed duplicate author!!!"
 
             # go through form, if we have removed a series, then copy data out of form to be passed into html for a pop-up
             removing_series=[]
@@ -820,7 +840,11 @@ def book(id):
                     s.calcd_rating = CalcAvgRating(s.id)
                     cnt=cnt+1
             db.session.commit()
-            st.SetMessage( "Successfully Updated Book (id={})".format(id) )
+            if message == None:
+                st.SetMessage( f"Successfully Updated Book (id={id})" )
+            else:
+                st.SetAlert("warning")
+                st.SetMessage( f"Successfully Updated Book (id={id})<br>BUT {message}" )
         else:
             st.SetAlert("danger")
             message=f"Failed to update Book (id={id}). "