diff --git a/cmd/build.go b/cmd/build.go
index 7a727ee..10c641c 100644
--- a/cmd/build.go
+++ b/cmd/build.go
@@ -103,16 +103,21 @@ should be enough for the next successful build).`,
 
 			attachmentsQuery := bibliographyNode.FindElements("[name()='link:link']")
 			itemAttachments := zoteroUnion.CreateElement("attachments")
+			mimeTypeMap := make(map[string]bool)
 			for _, attachment := range attachmentsQuery {
 				attachmentID := attachment.SelectAttr("rdf:resource").Value
 				zAttachment := root.FindElement(fmt.Sprintf("[@rdf:about='%s']", attachmentID))
 				mimeType := zAttachment.FindElement("[name()='link:type']").Text()
 				if mimeType != "text/html" {
-					itemAttachment := itemAttachments.CreateElement("attachment")
-					attachmentsIDs[attachmentID] = true
-					filePath := zAttachment.FindElement("[name()='rdf:resource']").SelectAttr("rdf:resource").Value
-					itemAttachment.CreateElement("path").SetText(filePath)
-					itemAttachment.CreateElement("mimeType").SetText(mimeType)
+					if !mimeTypeMap[mimeType] {
+						attachmentsIDs[attachmentID] = true
+						filePath := zAttachment.FindElement("[name()='rdf:resource']").SelectAttr("rdf:resource").Value
+						itemAttachments.CreateElement("attachment").CreateElement("path").SetText(filePath)
+						itemAttachments.CreateElement("attachment").CreateElement("mimeType").SetText(mimeType)
+						mimeTypeMap[mimeType] = true
+					} else {
+						fmt.Println("DUPLICATE mimeType:", mimeType, attachmentID)
+					}
 				}
 			}
 
@@ -206,8 +211,9 @@ should be enough for the next successful build).`,
 			}
 
 			zi, _ := xml.MarshalIndent(zoteroItem, " ", " ")
-			os.Stdout.Write(zi)
-			fmt.Println("\n~ ~ ~ ~ ~ ~")
+			_ = zi
+			// os.Stdout.Write(zi)
+			// fmt.Println("\n~+~ ~ ~ ~ ~")
 			// fmt.Printf("\nZoteroItem: %#v\n", zoteroItem)
 
 			bookOpf.Version = "2.0"
@@ -227,8 +233,8 @@ should be enough for the next successful build).`,
 				log.Fatalln(err)
 			}
 			_ = bookOpfOutput
-			//os.Stdout.Write(bookOpfOutput)
-			//fmt.Println("\n ~ ~ ~ ~ ~")
+			// os.Stdout.Write(bookOpfOutput)
+			// fmt.Println("\n ~ ~ ~ ~ ~")
 		}
 		calibre.RenderStandaloneApp(calibrePath, librarianName, libraryUUID, librarySecret, jsonPath)
 	},